It takes 24 hours for the Earth to complete one of these.
What is rotation on its axis?
100
This part of the comet exists when the comet is close to the sun and when it is far away from the sun.
What is the dust tail?
100
Earth's rotating on its axis helps keep our planet the proper temperature for life because of this.
What is it is the perfect amount of time between day and night. If night was too much longer temperatures would get too cold. If day was too much longer temperatures would get too hot.
100
An asteroid is this.
What is a rocky mass up to several hundrend kilometers wide that revolves around the sun?
200
Jupiter, Saturn, Uranus, and Neptune all have this in common.
What is they are all gaseous planets?
200
A shooting star is really one of these.
What is a meteor?
200
This is the center of the comet.
What is the nucleus?
200
This causes Mars and Saturn to have different lengths of years.
What is thier distance from and their orbit around the Sun.
200
A meteroid is this.
What is a small asteroid?
300
This causes temperatures at the North and South Poles to remain so cold throughout the year.
What is the tilt of Earth's axis?
300
This is why craters last for millions of years on the surface of the moon.
What is the wind does not have any water or wind to erode the craters?
300
This is the outer layer of the comet.
What is the coma?
300
This is how long it takes for Earth to revolve around the Sun.
What is one year?
300
A meteorite is this.
What is a piece of rock from a meteor that lands on Earth?
400
This is the correct order of the first four planets from the Sun.
What is Mercury, Venus, Earth, Mars?
400
This is the phase of the moon when the moon is passing between the earth and the sun.
What is the new moon?
400
This is the part of the comet that is only present when the comet is close to the sun.
What is the ion tail?
400
The seasons are caused because of this.
What is Earth's tilt?
400
Most ______________ burn up before they reach Earth's surface.
What is asteriods?
500
It is this season in the Southern Hemisphere when the Earth is tilted such that the Southern Hemisphere is closest to to Sun.
What is summer?
500
This is what happens to the tides when the moon and sun form a 90 degree angle with Earth.
What is the tides are low?
500
This is several times larger than the nucleus of the comet.