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- 1. Multiple Choice
Which fact BEST explains why there is life on Earth but not on the Moon?
The Moon has no gravity.
The Moon does not go around the Sun.
The Moon has little water and oxygen.
The Moon is much smaller than Earth.
- 2. Multiple Choice
Which properties are MOST important to sustaining life on Earth?
Time of rotation 24 hours and time of revolution about 365 days
time of revolution about 365 days and distance from the Sun 149,600,000 km
Distance from the Sun 149,600,000 km and surface structure rock and water
Surface structure rock and water and Orbit shape ellipse
- 3. Multiple Choice
Which characteristic of Earth’s early history most likely made life impossible to begin?
the lack of food sources
the lack of nighttime
the lack of sunshine
the lack of oxygen
- 4. Multiple Choice
In which characteristic does Earth differ from the other planets?
It has liquid water.
It is dense and small.
It is made up of rocky material.
It is surrounded by atmosphere.
- 5. Multiple Choice
What is significant about the discovery of water on Mars?
It proves there is life on Mars.
It provides evidence there may be life on Mars.
It proves there was an advanced civilization on Mars.
It provides evidence of an advanced civilization on Mars.
- 6. Multiple Choice
All of the planets in the solar system formed at about the same time from a large cloud of gas and dust. How is Earth different from other planets in the solar system?
Earth has no natural satellites.
Earth’s atmosphere is composed of gases.
Water is found in all three phases on Earth.
Volcanoes release liquid rock onto Earth’s surface.
- 7. Multiple Choice
Organisms can live on Earth because of Earth’s location in the solar system. How does Earth’s distance from the Sun MOST affect Earth’s water and enable life to exist?
It permits liquid water.
It allows water to freeze.
It changes water’s specific gravity.
It allows water to be salty or fresh.
- 8. Multiple Choice
Garden plants on Earth require four resources to stay alive: soil, air, water, and sunlight. How many of these resources are necessary for life to exist on another planet or the Moon?
4
3
2
1
- 9. Multiple Choice
Why are greenhouse gases important for sustaining life on Earth?
They keep the air clean.
They help keep Earth warm.
They help keep water moving on Earth.
They keep the wind from blowing too strongly.
- 10. Multiple Choice
Which pair would be MOST necessary for life to develop on another planet?
sulfur and nitrogen
helium and hydrogen
liquid water and carbon
chlorophyll and oxygen
- 11. Multiple Choice
Life is more likely to be found on a planet whose atmosphere contains abundant
neon
hydrogen
oxygen
sulfur dioxide
- 12. Multiple Choice
Which of the following is a reason life in the outermost planets is less likely than life on planets nearer the Sun?
They have too little mass.
They have too much mass.
Their surfaces are extremely hot.
Their surfaces are extremely cold.
- 13. Multiple Choice
Which of these conditions is MOST responsible for Earth having an environment that supports life?
oceans regulating climate on land
the percentage of nitrogen in the atmosphere
water that exists in all three physical states of matter
erupting volcanoes moderating atmospheric temperatures
- 14. Multiple Choice
Earth’s surface temperature is relatively stable. Which of these is MOST responsible for Earth’s surface temperatures?
solar radiation reflected from the Moon
many volcanic eruptions near the Ring of Fire
the greenhouse effect in the atmosphere
plankton distribution in shallow ocean waters
- 15. Multiple Choice
The temperature at which water freezes enables water to exist in which two forms on Earth?
freshwater rivers and saltwater oceans
liquid oceans and solid glaciers
atmospheric vapor and cloud droplets
water in soil and water in plants
- 16. Multiple Choice
How does gravity support life on Earth?
by forcing Earth to continuously spin on its axis, which contributes to day and night
by causing changes in the distance between Earth and the sun, which contributes to the seasons
by keeping water and gases in the atmosphere close to Earth’s surface, which contributes to life processes
by preventing meteors and comets from hitting Earth’s surface, which protects living organisms from space fragments
- 17. Multiple Choice
Of the planets in the solar system, which characteristic is unique to planet Earth?
orbited by a moon
has a gravitational field
revolves around the Sun
covered mostly by water
- 18. Multiple Choice
Which contributes to Earth’s ability to sustain life?
The atmosphere allows all of the sun’s radiation to enter due to Earth’s distance from the sun.
The atmosphere prevents all space debris from reaching the surface due to the ozone layer.
The atmosphere is extremely thin due to the temperatures of the sun.
The atmosphere is breathable due to the unique mixture of gases.
- 19. Multiple Choice
Which planet has characteristics that make it the MOST likely planet for the discovery of extra-terrestrial life?
Jupiter
Venus
Saturn
Mars
- 20. Multiple Choice
Which of the following helps keep the Moon in its orbit?
friction
gravity
latitude
longitude
- 21. Multiple Choice
If the Sun were larger, what would MOST likely also have to be true for Earth to sustain life?
Earth would have to be further from the Sun.
Earth would have to be closer to the Sun.
Earth would have to be smaller.
Earth would have to be larger.
- 22. Multiple Choice
Which of these describes a property of water that allows some liquid water to remain in frozen lakes?
Water can dissolve many different substances.
Water is less dense as a solid than as a liquid.
Water has a Mohs hardness of about 2 when it is frozen.
Water holds less air at higher temperatures.
- 23. Multiple Choice
Which of the following is MOST necessary for life to develop on another planet?
liquid water
rocky surfaces
warm soil
atmospheric oxygen
- 24. Multiple Choice
Which of these provide the BEST evidence that life could develop on Mars?
its atmospheric gases
its surface temperatures
its craters and rocky surface
its ice and organic molecules
- 25. Multiple Choice
The physical characteristics of the Sun and Earth are
The Earth and Sun have an atmosphere and the Sun has a hot gas surface.
The Earth and Sun have an atmosphere and the Sun has a rocky surface
Earth has an atmosphere and rocky surface, but the Sun does not have an atmosphere.
Earth has an atmosphere and a hot gas surface.
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