Which type of rays does the ozone protect us from?

What percent of the air we breathe is nitrogen?

What was the main source of air pollution before 1950?

Photochemical smog is caused by:

This gas can come in from basements and cause lung cancer.

The Ozone Hole was discovered in the 1970's and was caused by:

The lungs are ___ water.

Water pollutants include __________, heavy metals, and household chemicals.

Water pollution is ___________ globally due to the increasing human population.

Which type of source is identifiable and easy to monitor and regulate?

Which type of source is expensive to clean up?

This is the leading cause of water pollution.

The World Heath Organization states contaminated drinking water kills 3 million people annually, mostly under the age of:

How many people die annually from typhoid?

Trees being torn down to build housing developments is an example of:

How many pounds of garbage does each household produce on average?

Batteries contain _________ which are mined from the Earth and can be toxic to livings things if present in soil.

Nuclear plants can produce large amounts of energy through:

Deforestation leads to a steep imbalance in the rain cycle which leads to which of the following? Select all that apply.