Earth/moon/sun#1: Question Preview (ID: 7949)

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Summarize why life is possible on the Earth.
a) Earth is just the right size to support both plant and animal life b) Earth is the only planet with a magnetic field c) Earth is larger than Mercury and Mars, but smaller than Jupiter and Saturn. d) Earth has an atmosphere, liquid water, and a moderate temperature.
Day and night on Earth are due to:
a) The Earth's rotation b) the moon's orbit around the Earth c) the Earth's revolution d) the Earth's tilted axis
The revolution of the Earth around the sun takes approximately....
a) one month b) one day c) one year d) one decade
What is the central and largest body in the solar system?
a) Earth b) moon c) Jupiter d) sun
What force keeps the planets in a regular and predictable motion around the sun?
a) solar energy b) gravity c) nuclear energy d) cicumference
Which of the following correctly describes the sun?
a) it is a planet with a rocky surface b) it is a planet which has nuclear reactions that produce energy c) it is a star where nuclear reactions occur. d) it is a satellite that revolves around the planet
How long does it take the moon to revolve around the Earth?
a) 1 day b) 7 days c) 28 days d) 365 days
If an astronaut weighs 100 pounds on Earth, approximately what would he weigh on the moon?
a) 200 pounds b) 0 (there is no gravity in space) c) 100 pounds d) < 30 pounds
Auroras, or the northern lights, are caused by....
a) solar winds b) light reflecting off the polar caps c) protons and neutrons from solar winds mixing with gases in the Earth's atmosphere d) the sun
Regions of the sun that are cooler than the rest of the photosphere are known as....
a) sunspots b) spicules c) prominences d) solar flares
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