AP Environmental Science Flashcards: Soil Composition And Properties

What this deck covers

This deck focuses on Soil Composition And Properties, 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: Identify the soil horizon known as the topsoil.

Answer: A Horizon. Contains mixture of organic matter and weathered minerals.

Flashcard 2: Identify the soil particle with the smallest size.

Answer: Clay. Diameter less than 0.002mm with high surface area for retention.

Flashcard 3: What is the effect of organic amendments on soil?

Answer: Improve structure, fertility, and microbial activity. Add nutrients and beneficial organisms to enhance growth.

Flashcard 4: What are the three primary soil particles by size?

Answer: Sand, silt, and clay. Categorized by decreasing particle diameter from largest to smallest.

Flashcard 5: What is the effect of soil compaction on plant growth?

Answer: Reduces root penetration and water infiltration. Compressed particles decrease pore space for growth.

Flashcard 6: What is the soil texture triangle used for?

Answer: To classify soil texture based on particle size. Determines proportions of sand, silt, and clay in soil samples.

Flashcard 7: What is the effect of high soil pH on nutrient availability?

Answer: Decreases availability of some nutrients. Iron and phosphorus become less soluble in basic conditions.

Flashcard 8: What is the soil texture triangle used for?

Answer: To classify soil texture based on particle size. Determines proportions of sand, silt, and clay in soil samples.

Flashcard 9: Which soil type has the fastest drainage?

Answer: Sand. Large pore spaces between particles allow rapid water movement.

Flashcard 10: Identify the soil particle with the largest size.

Answer: Sand. Diameter ranges from 0.05-2.0mm, allowing rapid water drainage.

Flashcard 11: Identify the soil particle with the smallest size.

Answer: Clay. Diameter less than 0.002mm with high surface area for retention.

Flashcard 12: What is soil fertility?

Answer: Ability of soil to provide nutrients for plant growth. Combination of physical, chemical, and biological factors.

Flashcard 13: What is the primary mineral component of clay?

Answer: Silicates. Layered aluminum and silicon structures provide stability.

Flashcard 14: Identify the process of water movement through soil.

Answer: Percolation. Gravity-driven downward flow through soil layers.

Flashcard 15: What does soil texture affect?

Answer: Water retention, permeability, and workability. Particle size distribution determines physical behavior.

Flashcard 16: Identify the soil horizon rich in organic material.

Answer: O Horizon. Surface layer of fresh leaf litter and decomposing material.

Flashcard 17: What is humus?

Answer: Decayed organic matter in soil. Forms from decomposition by bacteria and fungi over time.

Flashcard 18: What is the primary component of mineral soil?

Answer: Inorganic material. Weathered rock fragments provide structure and nutrients.

Flashcard 19: What is the main consequence of soil degradation?

Answer: Decreased agricultural productivity. Loss of soil quality threatens food security worldwide.

Flashcard 20: What is soil porosity?

Answer: The volume of pores or spaces in soil. Determines water storage capacity and gas exchange in soil.

Flashcard 21: Which soil type has the fastest drainage?

Answer: Sand. Large pore spaces between particles allow rapid water movement.

Flashcard 22: What is the purpose of soil conservation?

Answer: Prevent soil erosion and degradation. Maintains productive agricultural land for future generations.

Flashcard 23: Identify the process of converting organic waste into humus.

Answer: Composting. Aerobic decomposition creates stable organic matter.

Flashcard 24: Which soil type has equal parts of sand, silt, and clay?

Answer: Loam. Approximately equal proportions create ideal agricultural conditions.

Flashcard 25: Which soil property affects nutrient availability?

Answer: Soil pH. Controls solubility and uptake of essential minerals.

Flashcard 26: What are the three primary soil particles by size?

Answer: Sand, silt, and clay. Categorized by decreasing particle diameter from largest to smallest.

Flashcard 27: What is the pH range of basic soil?

Answer: pH greater than 7. High hydroxide ion concentration can limit phosphorus uptake.

Flashcard 28: What is the role of earthworms in soil health?

Answer: Aerate soil and decompose organic matter. Create channels and mix organic matter throughout profile.

Flashcard 29: What is soil permeability?

Answer: The ability of soil to transmit water and air. Controlled by pore size and connectivity between particles.

Flashcard 30: What is soil permeability?

Answer: The ability of soil to transmit water and air. Controlled by pore size and connectivity between particles.

Flashcard 31: What is the B Horizon also known as?

Answer: Subsoil. Accumulation zone for leached minerals from upper layers.

Flashcard 32: What is the pH range of acidic soil?

Answer: pH less than 7. High hydrogen ion concentration affects nutrient availability.

Flashcard 33: How does vegetation affect soil erosion?

Answer: Reduces erosion by stabilizing soil. Root systems bind particles and slow water runoff.

Flashcard 34: Identify the soil horizon known as the topsoil.

Answer: A Horizon. Contains mixture of organic matter and weathered minerals.

Flashcard 35: What does soil texture affect?

Answer: Water retention, permeability, and workability. Particle size distribution determines physical behavior.

Flashcard 36: What is soil salinization?

Answer: Accumulation of soluble salts in soil. High salt content inhibits plant water uptake.

Flashcard 37: How does pH affect soil microbial activity?

Answer: Microbial activity is optimal near neutral pH. Extreme pH values reduce enzyme function and diversity.

Flashcard 38: How does pH affect soil microbial activity?

Answer: Microbial activity is optimal near neutral pH. Extreme pH values reduce enzyme function and diversity.

Flashcard 39: What is the role of soil microorganisms?

Answer: Decompose organic matter. Break down dead material into nutrients plants can absorb.

Flashcard 40: What is the effect of soil erosion on fertility?

Answer: Reduces fertility by removing topsoil. Loss of nutrient-rich surface layer reduces productivity.

Flashcard 41: Which soil type is best for agriculture?

Answer: Loam. Balanced mixture provides optimal drainage and retention.

Flashcard 42: Identify the soil horizon rich in organic material.

Answer: O Horizon. Surface layer of fresh leaf litter and decomposing material.

Flashcard 43: Which soil type is best for agriculture?

Answer: Loam. Balanced mixture provides optimal drainage and retention.

Flashcard 44: What is the cation exchange capacity (CEC)?

Answer: Ability of soil to hold and exchange cations. Measures soil's ability to retain essential plant nutrients.

Flashcard 45: Which soil type has the highest water retention?

Answer: Clay. Small particle size and high surface area retain more water.

Flashcard 46: Identify the soil particle with the largest size.

Answer: Sand. Diameter ranges from 0.05-2.0mm, allowing rapid water drainage.

Flashcard 47: What is the primary mineral component of clay?

Answer: Silicates. Layered aluminum and silicon structures provide stability.

Flashcard 48: What is the pH range of acidic soil?

Answer: pH less than 7. High hydrogen ion concentration affects nutrient availability.

Flashcard 49: Identify the soil layer where roots primarily grow.

Answer: A Horizon. Zone of maximum biological activity and nutrient concentration.

Flashcard 50: What is soil fertility?

Answer: Ability of soil to provide nutrients for plant growth. Combination of physical, chemical, and biological factors.

Flashcard 51: What is humus?

Answer: Decayed organic matter in soil. Forms from decomposition by bacteria and fungi over time.

Flashcard 52: Identify the process of converting organic waste into humus.

Answer: Composting. Aerobic decomposition creates stable organic matter.

Flashcard 53: What is the role of soil microorganisms?

Answer: Decompose organic matter. Break down dead material into nutrients plants can absorb.

Flashcard 54: What is the effect of high soil pH on nutrient availability?

Answer: Decreases availability of some nutrients. Iron and phosphorus become less soluble in basic conditions.

Flashcard 55: What role does organic matter play in soil?

Answer: Improves fertility and structure. Increases cation exchange capacity and water holding ability.

Flashcard 56: What is the importance of soil structure?

Answer: Influences water and air movement, root growth. Arrangement of particles affects physical properties.

Flashcard 57: What is the B Horizon also known as?

Answer: Subsoil. Accumulation zone for leached minerals from upper layers.

Flashcard 58: Which soil property affects nutrient availability?

Answer: Soil pH. Controls solubility and uptake of essential minerals.

Flashcard 59: What is the primary factor in determining soil color?

Answer: Organic matter content and mineral composition. Dark colors indicate high organic content and iron oxides.

Flashcard 60: What is the main cause of soil acidification?

Answer: Excessive rainfall leaching away basic ions. Natural process in high-rainfall regions removes base cations.