Earth Part 2 Review

Soil formation happens _____

• Deep within the earth
• on the earth's surface

Soil is a mix of weathered rock and ______ plant and animal matter.

• decayed
• living

Water and gas in the air form a weak _____ that eats away at rock

• mud
• acid

The decaying remains of plants and animals form a soil element called _____.

• fungus
• humus

The dark layer of soil at the surface is called ___.

• topsoil
• bedrock

The system of underground water is called __

• river system
• drainage basin
• groundwater
• aquifer

The main river and all its tributaries make a ___

• aquifer
• river system
• moraine
• sediment

A frozen mass of ice moves slowly downhill because of ____.

• gravity
• aquifer
• sediment
• moraine

A flowing mass of ice is called a ___

• sediment
• glacier
• moraine
• aquifer

A layer of rock on which ground water can gather and flow is an ____

• moraine
• glacier
• sediment
• aquifer