DK Chapter 4 Review

a mixture of sand, silt, clay

• loam

• soil

• humus

a layer of loose material that covers most of the Earth's land

• humus

• loam

• soil

remains of plants and animals that were once alive

• loam

• humus

• soil

When you choose to turn the water off while brushing your teeth, you are practicing

• reusing

• recycling

• conservation

What can you do to help the environment?

• recycle materials

• donate things to others

• turn off water when not using it

• all of these answers help the environment

Worms, spiders, and insects make their homes in topsoil.

• True

• False

Part of the Earth's crust shifts suddenly. The earthquake's vibrations travel at 10 kilometers per second. How many kilometers will they travel in 10 seconds?

• 100 km

• 50 km

• 1,000 km

• 10 km

Water is a natural resource.

• True

• False

a resource that cannot be replaced

• nonrenewable resource

• natural resource

• renewable resource

What tool measures wind?

• thermometer

• anemometer

• rain gauge

• stop watch