Weathering and Soil

Organic material provides nitrogen for plants. Which soil component contributes the most nitrogen to plants?

clay
humus
sand
silt

Humus

Which soil would most likely be found in the Arctic?

Andisols
Gelisols
Histosols
Spodosols

Gelisols

Which describe the effects of climate on the rate of weathering? Check all that apply.

Warm climates favor chemical weathering.
Cold climates favor mechanical weathering.
Chemical reactions occur faster at higher temperatures.
Lower precipitation levels lead to more chemical reactions.
The chemical reaction rates of minerals are not impacted by temperature.

Warm climates favor chemical weathering.
Cold climates favor mechanical weathering.
Chemical reactions occur faster at higher temperatures.

The map shows the Soils of America.

Which best describes the soils found in the southeastern United States?

frozen
sandy
weathered
young

Weathered

Which describes the formation of Horizon B?

forms at the surface
features parent material
undergoes the most change
forms due to decomposed material

undergoes the most change.

Which contribute to both chemical and mechanical weathering? Check all that apply.

abrasion
freezing
organisms
oxidation
water

organisms, water.

Which are causes of mechanical weathering? Check all that apply.

acid rain
plant growth
animal actions
carbon dioxide
pressure release

plant growth, animal actions, pressure release.

Which describe the horizons in a soil profile? Check all that apply.

Horizon A is mineral deficient.
Bedrock lies below the soil layers.
Horizon O forms from organic material.
Horizon B undergoes the least amount of change.
Horizon C is least affected by the soil formation process.

Bedrock lies below the soil layers.
Horizon O forms from organic material.
Horizon C is least affected by the soil formation process.

Which are factors that scientists use to classify orders of soil? Check all that apply.

fertility
climate
dryness
plant type
soil composition

climate, plant type, soil composition.

Which increase the rate of soil formation? Check all that apply.

mixed layers
large grain sizes
more precipitation
warmer temperatures
very hard parent material

large grain sizes, more precipitation, warmer temperatures.