AP Environmental Science Flashcards: Soil Formation And Erosion

What this deck covers

This deck focuses on Soil Formation And Erosion, giving you a quick way to review the definitions, rules, and examples that matter most for AP Environmental Science.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: Which soil property affects water retention and permeability?

Answer: Texture. Particle size distribution affects how water and nutrients move through soil.

Flashcard 2: Which soil particle is the smallest: sand, silt, or clay?

Answer: Clay. Clay particles are less than 0.002 mm in diameter.

Flashcard 3: What is the term for the vertical sequence of soil layers?

Answer: Soil profile. Distinct layers form as soil develops from surface to bedrock.

Flashcard 4: Identify the practice of planting different crops in succession on the same land.

Answer: Crop rotation. Rotating crops prevents nutrient depletion and breaks pest cycles.

Flashcard 5: What is the function of soil aeration?

Answer: Improves air and water flow. Pore spaces allow oxygen to reach roots and water to infiltrate.

Flashcard 6: Which soil particle allows for good drainage but poor nutrient retention?

Answer: Sand. Large particles create pore spaces but cannot hold nutrients effectively.

Flashcard 7: Name the process by which rocks are broken down into soil.

Answer: Weathering. Physical and chemical processes break down rock into smaller particles over time.

Flashcard 8: What is soil composed of?

Answer: Minerals, organic matter, air, and water. These four components combine in varying proportions to form soil.

Flashcard 9: Name a soil amendment used to raise pH.

Answer: Lime. Calcium carbonate neutralizes soil acidity and increases pH levels.

Flashcard 10: What is the effect of organic matter on soil structure?

Answer: Improves structure. Organic matter creates aggregation and increases water-holding capacity.

Flashcard 11: What is the main component of soil that provides structure?

Answer: Clay. Clay particles bind together and create stable soil aggregates.

Flashcard 12: Which soil conservation method involves planting grass or trees to anchor soil?

Answer: Reforestation. Plant roots physically hold soil particles in place against erosion.

Flashcard 13: Name the process that converts solid rock into smaller fragments.

Answer: Disintegration. Physical breakdown of bedrock creates the mineral component of soil.

Flashcard 14: Identify the horizon known as subsoil.

Answer: B horizon. Located below the A horizon where nutrients accumulate from above.

Flashcard 15: Which soil particle is the smallest: sand, silt, or clay?

Answer: Clay. Clay particles are less than 0.002 mm in diameter.

Flashcard 16: What is the term for the top layer of soil rich in organic material?

Answer: Humus. Decomposed organic matter forms a dark, nutrient-rich layer at the surface.

Flashcard 17: Identify the type of soil that is best for growing crops.

Answer: Loam. Equal parts sand, silt, and clay create ideal drainage and fertility.

Flashcard 18: Identify the primary agent of chemical weathering.

Answer: Water. Water dissolves minerals and causes chemical reactions that decompose rock.

Flashcard 19: What is the term for the movement of dissolved substances through soil?

Answer: Percolation. Gravity pulls water and dissolved materials downward through soil layers.

Flashcard 20: Which soil particle allows for good drainage but poor nutrient retention?

Answer: Sand. Large particles create pore spaces but cannot hold nutrients effectively.

Flashcard 21: What is the role of decomposers in soil formation?

Answer: Break down organic matter. Bacteria and fungi decompose dead plants and animals into soil nutrients.

Flashcard 22: What is the term for soil's ability to hold water and nutrients?

Answer: Soil fertility. Nutrient content and water-holding capacity determine plant growth potential.

Flashcard 23: Which soil conservation technique uses alternating strips of crops?

Answer: Strip cropping. Alternating strips reduce wind speed and trap eroded soil particles.

Flashcard 24: Which type of weathering involves physical forces breaking rocks into smaller pieces?

Answer: Mechanical weathering. Physical forces like freeze-thaw cycles fracture rocks without chemical changes.

Flashcard 25: What is the ideal pH range for most agricultural soils?

Answer: 6 to 7.5. This range provides optimal nutrient availability for most crop plants.

Flashcard 26: Name the process that leads to soil compaction.

Answer: Tillage. Repeated plowing and cultivation compress soil particles together.

Flashcard 27: What is the effect of organic matter on soil structure?

Answer: Improves structure. Organic matter creates aggregation and increases water-holding capacity.

Flashcard 28: What is the main cause of soil salinization?

Answer: Irrigation. Adding water with dissolved salts increases soil salt concentration over time.

Flashcard 29: What is the primary factor influencing soil formation?

Answer: Climate. Temperature and precipitation patterns determine weathering rates and soil development.

Flashcard 30: Name the process by which soil is transported by wind or water.

Answer: Erosion. Moving water and wind carry away soil particles from their original location.

Flashcard 31: Identify the primary agent of chemical weathering.

Answer: Water. Water dissolves minerals and causes chemical reactions that decompose rock.

Flashcard 32: Name the process by which organic material is broken down in soil.

Answer: Decomposition. Microorganisms break down dead organic material into simpler compounds.

Flashcard 33: What is the main cause of soil salinization?

Answer: Irrigation. Adding water with dissolved salts increases soil salt concentration over time.

Flashcard 34: Which soil conservation technique uses alternating strips of crops?

Answer: Strip cropping. Alternating strips reduce wind speed and trap eroded soil particles.

Flashcard 35: What is the term for the practice of maintaining a vegetation cover on soil?

Answer: Cover cropping. Continuous plant cover protects soil from wind and water erosion.

Flashcard 36: Which process involves the loss of soil nutrients through water movement?

Answer: Leaching. Downward water movement carries dissolved nutrients away from plant roots.

Flashcard 37: Name the process by which rocks are broken down into soil.

Answer: Weathering. Physical and chemical processes break down rock into smaller particles over time.

Flashcard 38: What is the primary factor influencing soil formation?

Answer: Climate. Temperature and precipitation patterns determine weathering rates and soil development.

Flashcard 39: What is the effect of acidic conditions on soil nutrient availability?

Answer: Reduces availability. Low pH makes essential nutrients less available to plant roots.

Flashcard 40: Which process involves the loss of soil nutrients through water movement?

Answer: Leaching. Downward water movement carries dissolved nutrients away from plant roots.

Flashcard 41: What is the term for the vertical sequence of soil layers?

Answer: Soil profile. Distinct layers form as soil develops from surface to bedrock.

Flashcard 42: What is the primary component of soil that determines its color?

Answer: Organic matter. Dark organic matter gives soil its characteristic brown or black color.

Flashcard 43: Which soil property affects water retention and permeability?

Answer: Texture. Particle size distribution affects how water and nutrients move through soil.

Flashcard 44: Identify the soil layer that contains the most organic material.

Answer: O horizon. The surface organic layer contains fresh and partially decomposed plant matter.

Flashcard 45: Identify the soil property that affects its ability to support plant life.

Answer: Fertility. Nutrient content determines how well plants can grow in the soil.

Flashcard 46: Name the process of soil formation from parent material.

Answer: Pedogenesis. The scientific term for soil development from weathered rock material.

Flashcard 47: Identify the soil layer that contains the most organic material.

Answer: O horizon. The surface organic layer contains fresh and partially decomposed plant matter.

Flashcard 48: Name a common method to prevent soil erosion on slopes.

Answer: Terracing. Creating stepped platforms reduces slope angle and water runoff velocity.

Flashcard 49: Identify the practice of planting different crops in succession on the same land.

Answer: Crop rotation. Rotating crops prevents nutrient depletion and breaks pest cycles.

Flashcard 50: What is the primary component of soil that determines its color?

Answer: Organic matter. Dark organic matter gives soil its characteristic brown or black color.

Flashcard 51: Which soil horizon is known as the topsoil?

Answer: A horizon. The surface layer contains the most organic matter and biological activity.

Flashcard 52: Identify the horizon known as subsoil.

Answer: B horizon. Located below the A horizon where nutrients accumulate from above.

Flashcard 53: What is the ideal pH range for most agricultural soils?

Answer: 6 to 7.5. This range provides optimal nutrient availability for most crop plants.

Flashcard 54: Name the process of soil formation from parent material.

Answer: Pedogenesis. The scientific term for soil development from weathered rock material.

Flashcard 55: What is the term for soil's ability to hold water and nutrients?

Answer: Soil fertility. Nutrient content and water-holding capacity determine plant growth potential.

Flashcard 56: Which soil horizon is known as the topsoil?

Answer: A horizon. The surface layer contains the most organic matter and biological activity.

Flashcard 57: Name the process by which organic material is broken down in soil.

Answer: Decomposition. Microorganisms break down dead organic material into simpler compounds.

Flashcard 58: Which type of weathering involves physical forces breaking rocks into smaller pieces?

Answer: Mechanical weathering. Physical forces like freeze-thaw cycles fracture rocks without chemical changes.

Flashcard 59: Name the process that leads to soil compaction.

Answer: Tillage. Repeated plowing and cultivation compress soil particles together.

Flashcard 60: Identify the soil layer that contains partially disintegrated rock.

Answer: C horizon. This layer sits above bedrock and shows early stages of soil development.

Flashcard 61: What is the function of soil aeration?

Answer: Improves air and water flow. Pore spaces allow oxygen to reach roots and water to infiltrate.

Flashcard 62: What is the main component of soil that provides structure?

Answer: Clay. Clay particles bind together and create stable soil aggregates.

Flashcard 63: What is the term for the practice of maintaining a vegetation cover on soil?

Answer: Cover cropping. Continuous plant cover protects soil from wind and water erosion.

Flashcard 64: What is the term for the movement of dissolved substances through soil?

Answer: Percolation. Gravity pulls water and dissolved materials downward through soil layers.

Flashcard 65: Name the process by which soil is transported by wind or water.

Answer: Erosion. Moving water and wind carry away soil particles from their original location.

Flashcard 66: Which soil conservation method involves planting grass or trees to anchor soil?

Answer: Reforestation. Plant roots physically hold soil particles in place against erosion.

Flashcard 67: What is the role of decomposers in soil formation?

Answer: Break down organic matter. Bacteria and fungi decompose dead plants and animals into soil nutrients.

Flashcard 68: What is soil composed of?

Answer: Minerals, organic matter, air, and water. These four components combine in varying proportions to form soil.