Natural Resources 1 - Water and Air

Planting on the contour is a soil conservation method described as:

• making ridges of earth across a slope.

• planting across the slope of a hill.

• planting different crops from year to year.

• constructing small ditches across slopes.

Part of the hydrologic cycle, water from the surface of the oceans being changed into water vapor and moved into the atmosphere is called:

• evaporation.

• precipitation.

• runoff.

• transpiration.

Which best describes the percentage of Earth’s water that is salt water?

• 20 percent

• 42 percent

• 79 percent

• 97 percent

A watershed can best be described as a/an:

• land area from which all of the water that does not infiltrate the soil runs to a downhill location.

• area from within the earth that collects water.

• land area used to pump water to higher elevations.

• device used to sanitize water for human consumption.

The two major types of air pollutants are:

• bacteria and fungi.

• gases and carbon dioxide.

• suspended solid particles and oxygen.

• suspended solid particles and gases.

The greatest problems of air pollution are caused by:

• animals.

• humans.

• nature.

• water.

The major effect of air pollution on the climate has been:

• the greenhouse effect.

• cooling temperatures.

• eutrophication.

• the standard cosmological model.

Small pieces of material in the air similar to dust and liquid droplets are best known as:

• gases.

• oxides.

• particulate matter.

• photochemical matter.

A catalytic converter on a car and a scrubber used on a smokestack:

• controls emissions.

• damages ecosystems.

• increases recycling.

• creates particulate matter.

The best example of air pollution that affects wildlife, especially fish, is:

• acid rain

• asphyxiation

• odor

• ozone depletion