3.2 - What keeps us and other organisms alive?

Question 1

Biosphere

Answer 1

Consists of the atmosphere, hydrosphere, and geosphere; where life exists

Question 2

Atmosphere

Answer 2

is a thin spherical envelope of gasses surrounding the earth’s surface.

Question 3

Troposphere

Answer 3

Inner layer of the atmosphere. Extends only about 17 kilometers (11 miles) above sea level at the tropics and about 7 kilometers (4 miles) above the earth’s north and south poles. Contains the majority of the air that we breathe.

Question 4

Stratosphere

Answer 4

Its lower portion contains enough ozone (O3) gas to filter out most of the sun’s harmful ultraviolet radiation.

Question 5

Hydrosphere

Answer 5

consists of all of the water on or near the earth’s surface.

Question 6

Geosphere

Answer 6

consists of the earth’s intensely hot core, a thick mantle composed mostly of rock, and a thin outer crust.

Question 7

Greenhouse gasses

Answer 7

trap heat and thus warm the lower atmosphere.
-Carbon dioxide, methane, water vapor

Question 8

Biomes

Answer 8

large regions such as forests, deserts, and grasslands, with distinct climates and certain species (especially vegetation) adapted to them.

Question 9

Aquatic Life Zones

Answer 9

large regions such as forests, deserts, and grasslands, with distinct climates and certain species (especially vegetation) adapted to them.

Question 10

Solar Energy Facts

Answer 10

The ozone layer absorbs 95% of the sun’s harmful UV radiation
~1% of the solar radiation reaches the earth’s surface