What characteristics of the planet, Earth, is essential to the survival of living organisms?

Earth has abundant available water.

What characteristics of a planet will influence whether its temp. will be suitable to life?

The distance from the Sun of its orbit

Earth is 150 mil. km from the Sun. If it was 200 mil. km away, it wouldn't support life because

the temperature would be too cold.

What discovery about Mars suggests conditions that may have once supported life? Mars has

small amounts of water in the soil.

The magnetic field of Earth protects life against -

high energy particles from the Sun.

What characteristics of Jupiter explains why Jupiter does not support life, while Earth does?

has virtually no water on the surface.

If Earth were much smaller, it would not support life because it would not have enough mass to

have sufficient gravity to hold an atmosphere.

What data could be collected, that gives scientists info about if life exists on that planet?

The presence of an atmospheric ozone layer

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7.9A Characteristics of the Solar System

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First Section of the Earth Unit

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Questions 15

Answers

1
What characteristics of the planet, Earth, is essential to the survival of living organisms?
Earth has abundant available water.
Earth orbits the Sun once every 365 days.
Earth rotates on its axis once every 24 hours.
Earth has just one orbiting moon.
2
What characteristics of a planet will influence whether its temp. will be suitable to life?
The tilt of the axis of rotation of the planet
The amount of its gravitational force
The distance from the Sun of its orbit
The number and size of active volcanoes
3
Earth is 150 mil. km from the Sun. If it was 200 mil. km away, it wouldn't support life because
there would be less exposure to solar wind.
the oxygen would leave the atmosphere.
the surface water would evaporate.
the temperature would be too cold.
4
Magnetic Lines of force from Earth's polar north and south, acting like a giant magnet
Ozone layer
Earth's Magnetic field
Atmosphere
Magnetosphere
5
What discovery about Mars suggests conditions that may have once supported life? Mars has
small amounts of water in the soil.
two moons orbiting the planet.
only a small amount of atmosphere.
the tallest mountain in the solar system.
6
The habitable zone for the star is about 225 mil. km away. Which planet can support life?
Planet W
Planet Z
Planet Y
Planet X
7
What is the most important factor that determines Earth’s temperature?
Gas composition of the atmosphere
Proximity to the Sun
Distance to the Moon
Amount of water on the planet
8
Ozone contributes to supporting life on earth by blocking -
ultraviolet light.
atmospheric heat.
water vapor.
helium ions.
9
The magnetic field of Earth protects life against -
high energy particles from the Sun.
debris ejected from the Moon.
ultraviolet radiation from the stars.
falling meteors from outer space.
10
What characteristics of Jupiter explains why Jupiter does not support life, while Earth does?
orbits the Sun once every 12 years.
rotates on its axis once every 10 hours.
has virtually no water on the surface.
has four moons that orbit the planet.
11
Area that deflects and traps harmful particles that stream from the Sun due to the solar wind
Ozone layer
Atmosphere
Magnetosphere
Earth's Magnetic field
12
If Earth were much smaller, it would not support life because it would not have enough mass to
have sufficient gravity to hold an atmosphere.
collect needed radiant energy from the Sun.
rotate on its axis once per day.
maintain a gravitational pull on the Moon.
13
Layer of ozone in upper atmosphere of Earth is important to life because it shields Earth from
changes in temperature.
impacts from meteors.
solar winds.
ultraviolet radiation.
14
What data could be collected, that gives scientists info about if life exists on that planet?
The orbit length of the planet
The presence of an atmospheric ozone layer
How long the planet takes to rotate
The number of other planets in the system
15
Gas in the Earth's atmosphere that absorbs most of the damaging ultraviolet radiation from sun
Atmosphere
Magnetosphere
Ozone layer
Earth's magnetic field

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