The Conditions for Life on Earth

The placement of a planet in the ___________ zone of a solar system means it is not too far from the star it orbits, nor too close

• life

• habitable

• proximal

• habitat

Earth's ___________ field deflects solar winds

• Magnetic

• Gravitational

• Electric

• Astrophysical

Earth's _____________ field holds the atmosphere in place

• Magnetic

• Gravitational

• Electric

• Astrophysical

The stable temperature range for life is:

• -70 to 70 C

• -50 to 50 C

• 0 to 50 C

• -20 to 45 C

This effect, caused by gasses in the atmosphere, keeps heat from reflecting back into space

• hothouse

• coulomb

• butterfly

• greenhouse

Heat being reflected back into space is called the

• greenhouse effect

• hothouse effect

• albedo effect

• butterfly effect

This chemical reaction is responsible for the creation of oxygen in the atmosphere and the greening of earth

• cellular respiration

• acid-base neutralization

• combustion

• photosynthesis

No living thing consists of less than ______% water

• 10

• 25

• 50

• 65

Oceans cover what fraction of the earth?

• 1/2

• 2/3

• 1/3

• 3/4

First water likely came from

• algae

• volcanic activity

• Mars

• the poles