Land, Air, and Water Resources

Most of the Earth's water (about 97 percent) is

• salt water in the oceans.
• freshwater in lakes and rivers.
• in the form of snow or ice.
• in the clouds.

Garden plants usually grow better in topsoil than subsoil, because

• subsoil holds too much water.
• topsoil contains more nutrients.
• topsoil contains no rock fragments.
• subsoil has no plant or animal material.

Many uses of land, including logging, mining, and farming, expose the soil, which can lead to

• erosion.
• nutrient depletion.
• crop rotation.
• development.

Tags

NGSS.MS-ESS3-4

A full landfill is covered to keep out rainwater.  This step is taken to

• prevent desertification.
• protect biodegradeable materials.
• help with recycling.
• prevent the formation of leachate.

Most water pollution is the result of

• human activities.
• drought.
• volcanic eruptions.
• storms.

Tags

NGSS.MS-ESS3-3

NGSS.MS-ESS3-4

The ozone layer protects people from which of the following?

• carbon monoxide poisoning
• too much ultraviolet radiation
• the effects of radon
• surfing

You should not use a charcoal grill indoors, because

• charcoal contains radon.
• burning causes nutrient depletion.
• burning charcoal causes acid rain.
• burning produces carbon monoxide.

What is the original source of the heat that is trapped by the greenhouse effect?

• atmosphere
• Earth's surface
• sunlight
• escaping heat

The process of replacing topsoil and planting grass to restore a former mining area is called land reclamation.

• True
• False

Precipitation that is more acidic than normal because of air pollution is called

• smog.
• acid rain.
• ozone.
• emissions.