Term
| atmosphere is a mixture of gases |
|
Definition
| -nitrogen (78 percent), oxygen (21 percent), argon (1 percent), and trace gases, such as water vapor and carbon dioxide. |
|
|
Term
how does the atmosphere is classified into four layers ?
[image] |
|
Definition
-The atmosphere is classified into four layers according to the temperature gradient.
-The temperature decreases with altitude in the troposphere, the first layer; then similarly increases in the stratosphere, the second layer; decreases in the mesosphere, the third layer; and increases in the thermosphere (ionosphere), the fourth layer. |
|
|
Term
|
Definition
- is the lowest portion of Earth's atmosphere. It contains approximately 75% of the atmosphere's mass and 99% of its water vapor and aerosols.
-the layer in which weather occurs, supports life on Earth. |
|
|
Term
|
Definition
| -is less dense than the troposphere but has a similar composition except that this second layer is nearly devoid of water. |
|
|
Term
|
Definition
-the outermost layer of the atmosphere, is almost devoid of air and receives the direct rays of the Sun.
-provides a good illustration of the difference between temperature and heat. |
|
|
