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D - Science - Unit 6

Layers of the Atmosphere - Part 1

How many main layers are in the earth's atmosphere? four
The main layers in the earth's atmosphere are classified according to what? changes in temperature
What are the names of the atmosphere's main layers? troposphere, stratosphere, mesosphere, and thermosphere
Which layer of the atmosphere does weather occur and we live in? troposphere
As altitude increases in the troposphere, what happens to the temperature? it decreases
What happens to water at the top of the troposphere? it forms thin, feathery clouds of ice
Although the troposphere is the shallowest layer, what does it contain almost all of the mass of the atmosphere
What happens to the temperature at the top of the troposphere? it stops decreasing
How does the depth of the troposphere vary? from 16 kilometers above the equator to less than 9 kilometers above the North and South poles
Why is the ozone layer important? it protects earth's living things from dangerous ultraviolet radiation from the sun, it acts as a shield for the Earth's surface and absorbs energy from the sun
Why is the thermosphere so hot? the sunlight strikes this layer first, which cause the nitrogen and oxygen molecules to convert this energy into heat
Why would an ordinary thermometer show a low temperature in the thermosphere? the molecules in this layer are spaced far apart, so there are not enough of them to collide with a thermometer and warm it
What causes Auroras? particles from the sun enter the ionosphere near the poles and strike atoms in the ionosphere, causing them to glow
What are the brilliant light displays in the Northern Hemisphere called? Northern Lights or aurora borealis
In which layer is the air pressure the highest? troposphere
Which layer separates the troposphere from the stratosphere? tropopause
Which layer is the coldest region of the atmosphere? mesosphere
Which layer has the thinnest air? thermosphere
Why is the thermosphere so hot? sunlight strikes the thermosphere first and turns the energy from the ultraviolet radiation into heat
What happens to gas particles in the ionosphere? they absorb ultraviolet and x-ray radiation causing them to become electrically charged (they become ions)
What bounce off of the ions in the ionosphere sending them back to Earth's surface? radio waves
In which layer of the atmosphere do satellites orbit the Earth? exosphere
Created by: lprinke