Science

A loose mixture of rock fragments, organic matter, water, and air that can support the growth of vegetation is called

• humus

• soil

• compost

• organic matter

Dark, organic material formed in soil from decayed remains of plants and animals is _____________

• soil

• humus

• compost

• organic matter

A(n) ____________ is a vertical section of soil that shows all the different layers, or horizons in the soil.

• soil profile

• soil horizon

• humus

• soil

Soil is made of

• weathered rocks and minerals
• dead plants and animals
• air and water
• all of the above

Tags

NGSS.MS-LS2-3

What do we call the layers of soil?

• Deposits
• Horizons
• Minerals
• Rocks

The very top layer of soil is mostly made of

• Solid rock 
• Clay and mineral deposits
• A mixture of minerals and organic material
• Mostly organic material (humus)

Which layer of soil is on the bottom?

• topsoil
• subsoil
• bedrock
• bottomsoil

Decayed organic material in soil is called______.

• Litter
• Silt
• Humus
• Clay

What does weathering mean?

• To form or create new
• To build up
• To break down
• To completely destroy

Tags

NGSS.MS-ESS2-1

Which horizon is made up of partially weathered rocks?

• Horizon A
• Horizon B
• Horizon C
• Horizon D or R