Soil composition

What is the composition of humus?

• sand and water

• subsoil

• inorganic material

• organic material

What is the composition of Level C in a soil profile?

• topsoil mixed with inorganic material

• weathered rock fragments

• clay and silt mixed with sand

• decayed organic material

Which phrase best describes what a soil horizon is?

• each layer of a soil profile

• the bottom layer of a soil profile

• the place where a soil profile meets bedrock

• the place where two soil profiles meet

Which horizon in a soil profile contains nutrients as a result of leaching?

• horizon E

• horizon B

• horizon C

• horizon A

Which organic matter in soil do plants need to grow?

• water

• bacteria

• air

• nitrogen

What is the correct order of sediment size in these materials, from smaller particles to bigger particles?

• silt – clay – sand

• silt – sand – clay

• sand – silt – clay

• clay – silt – sand

What is the name given to the type of rock from which a soil forms?

• parent material

• sand

• lichen

• clay

Which type of soil holds the most water?

• loam

• sand

• clay

• silt

Which climate has moderate rainfall, nutrient rich soils, and has a relatively thick layer of topsoil?

• Tropical rainforest

• grassland

• arctic

• desert

Tags

NGSS.MS-LS2-3

Which type of soil holds the least water?

• clay

• loam

• sand

• silt