Science Chapter 2 TEST Review

What is crumbly, dark soil that is a mixture of humus, clay, and other materials?

• subsoil
• topsoil
• bedrock
• loam

Abrasion is when sand and other rock particles that are carried by organisms, water, or ice wear away exposed rock surfaces.

• True
• False

What type of soil is made of about equal parts clay, sand, and silt and is the "best" soil for growing most plants?

• topsoil
• bedrock
• loam
• subsoil

What forms as plant and animal remains decay?

• loam
• topsoil
• bedrock
• humus

The type of soil and climate are the most important factors that determine the rate at which weathering occurs.

• True
• False

Geologists infer that the processes from the past still shape the Earth today. What is this called?

• erosion
• permeable
• uniformitarianism
• soil conservation

Rocks that are ____ are full of connected air spaces and weather more easily.

• permeable
• bedrock
• freezing and thawing
• eroding

Often called topsoil and is a mixture of humus, clay, and other materials

• Horizon C
• Horizon A
• Horizon B 

Living organisms may produce weak acids that slowly dissolve rock around roots where plants grow.

• True
• False

What is the name for the organisms that break down animal and plant remains?

• decomposer
• humus source
• burrower