Exam 17: The Atmosphere

Chlorofluorocarbons are compounds that react with ____.

____________________ reacts in moist air to produce sulfuric acid.

Little radiation is absorbed in the ____________________ (between about 55 and 80 kilometers above Earth's surface), and the thin air is extremely cold.

The most abundant constituent of our atmosphere is ____.

When coal burns, some minerals escape from the chimney as ____________________, which settles as gritty dust.

What was James Lovelock's hypothesis?

During the ____________________, about 2.4 billion years ago, oxygen concentration in the atmosphere increased to appreciable quantities.

Without an atmosphere, describe what the Earth would be like.

When did cyanobacteria first begin producing oxygen?

The layer of air closest to Earth, the layer we live in, is the ____________________.

How much is a bar and a millibar when expressing pressure?

What happens during photosynthesis?

In the ____, temperature increases with altitude, because ozone absorbs ultraviolet radiation.

Ozone is both a pollutant and a beneficial component of the atmosphere, depending on elevation.

A toxic ____________________ is a byproduct of any process that releases harmful compounds into the air.

What impact does ultraviolet radiation have on organisms?

What are the oldest known mineral grains on Earth? How old are they and in what material are they preserved in?

The largest source of air pollutants in the United States come from ____.

Describe the stratopause, mesosphere, mesopause, and thermosphere.

Which statement about dioxin is true?