Unit 2 Review | Soil Horizons

What is the O Horizon in soil?

• The O Horizon is the inorganic layer of soil, primarily composed of minerals.

• The O Horizon is the organic layer of soil, primarily composed of decomposed leaves and other organic materials.

• The O Horizon is the layer of soil that contains the highest concentration of clay.

• The O Horizon is the layer of soil that is primarily composed of sand and gravel.

What is the role of gravity in the formation of rivers?

• Gravity causes water to flow from higher elevations to lower elevations, forming rivers.

• Gravity pulls water upwards, creating lakes and ponds.

• Gravity has no effect on the formation of rivers.

• Gravity only affects the speed of water flow in rivers.

What is weathering?

• The process of breaking down rocks into smaller pieces through natural forces like wind, water, and temperature changes.

• The process of forming new rocks from molten lava.

• The process of transporting sediments from one location to another.

• The process of creating soil from organic matter.

What is organic matter in soil?

• Decomposed plant and animal material that provides nutrients for plants.

• A type of mineral found in rocks.

• Synthetic fertilizers used for plant growth.

• Water content in the soil.

What is the difference between weathering and erosion?

• Weathering is the breaking down of rocks, while erosion is the movement of those broken materials from one location to another.

• Weathering is the movement of rocks, while erosion is the breaking down of those rocks.

• Weathering and erosion are the same processes that occur simultaneously.

• Weathering is the process of planting trees, while erosion is the process of cutting them down.

What is erosion?

• Erosion is the process by which broken down rocks and soil are moved from one place to another by natural forces such as wind, water, ice, or gravity.

• Erosion is the process of plants growing in soil and stabilizing the ground.

• Erosion is the chemical breakdown of rocks due to acid rain.

• Erosion is the process of volcanic activity that creates new landforms.

What is sediment?

• Small particles of rock, minerals, and organic material transported by wind, water, or ice.

• A type of soil used for farming.

• A large body of water that is stagnant.

• A mineral found only in igneous rocks.

What is the C Horizon in soil?

• A layer of topsoil rich in organic matter

• The layer of soil that consists of weathered rock and minerals from which the soil develops.

• A layer of subsoil that is high in clay content

• The surface layer of soil that is most fertile

What is the B Horizon in soil?

• The top layer of soil rich in organic matter.

• The layer of soil that accumulates minerals and nutrients leached from the upper layers.

• The layer of soil primarily composed of bedrock.

• The layer of soil that is mostly sand and gravel.

What is a watershed?

• An area of land where all the water that falls on it drains into a common body of water, such as a river or lake.

• A type of water purification system used in urban areas.

• A geographical term for a mountain range.

• A method of irrigation used in agriculture.