7.3.1;Naun

Question 1

Atmosphere

Answer 1

the envelope of gases surrounding the earth or another planet

Question 2

Altitude

Answer 2

the height of an object or point in relation to sea level or ground level

Question 3

Density

Answer 3

he degree of compactness of a substance

Question 4

Troposphere

Answer 4

the lowest region of the atmosphere, extending from the earth’s surface to a height of about 3.7–6.2 miles (6–10 km), which is the lower boundary of the stratosphere

Question 5

Stratosphere

Answer 5

the layer of the earth’s atmosphere above the troposphere, extending to about 32 miles (50 km) above the earth’s surface (the lower boundary of the mesosphere).

Question 6

Mesosphere

Answer 6

the region of the earth’s atmosphere above the stratosphere and below the thermosphere, between about 30 and 50 miles (50 and 80 km) in altitude.

Question 7

Thermosphere

Answer 7

the region of the atmosphere above the mesosphere and below the height at which the atmosphere ceases to have the properties of a continuous medium. The thermosphere is characterized throughout by an increase in temperature with height.

Question 8

Exosphere

Answer 8

the outermost region of a planet’s atmosphere.

Question 9

Temperature

Answer 9

the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.

Question 10

Nitrogen

Answer 10

the chemical element of atomic number 7, a colorless, odorless unreactive gas that forms about 78 percent of the earth’s atmosphere. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant.

Question 11

Carbon

Answer 11

the chemical element of atomic number 6, a nonmetal which has two main forms (diamond and graphite) and which also occurs in impure form in charcoal, soot, and coal.

Question 12

Dioxide

Answer 12

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the chemical element of atomic number 6, a nonmetal which has two main forms (diamond and graphite) and which also occurs in impure form in charcoal, soot, and coal.

Question 13

Oxygen

Answer 13

a colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.

Question 14

altitude

Answer 14

the height of an object or point in relation to sea level or ground level.

Question 15

air pressure

Answer 15

he force exerted on a surface by the air above it as gravity pulls it to Earth

Question 16

concentration

Answer 16

the action or power of focusing one’s attention or mental effort

Question 17

condition

Answer 17

the state of something with regard to its appearance, quality, or working order.