The line passing through Earth's center and poles.
What is axis?
100
The push or pull on an object.
What is force?
100
The different shapes of the moon you see from Earth caused by the motions of the moon around the Earth.
What is phases?
100
The rise and fall of ocean water that occurs every 12.5 hours or so.
What is tides?
200
An object that orbits the sun, is rounded by its own gravity.
What is a planet?
200
The movement of Earth around its axis.
What is rotation?
200
The amount of matter in an object.
What is mass?
200
The larger, less dark part of the moon's shadow on Earth of a partial solar eclipse.
What is the penumbra?
200
The gravity of the sun and the moon pull in the same direction. Their combined forces produce the greatest difference between consecutive low and high tides.
What is a spring tide?
300
The streak of light produced when a small object burns up entering Earth's atmosphere.
What is a meteor?
300
The movement of Earth around the sun.
What is revolution?
300
The tendency of an object to resist a change in motion.
What is inertia?
300
The very darkest part of the moon's shadow during a total eclipse.
What is the umbra?
300
During a moon's first and third quarter, the sun is at a right angles to the line of the Earth and the moon, causing a tide with the least difference between consecutive high and low tides.
What is a neap tide?
400
A cold mixture of dust and ice that gives off a long trail of light as it approaches the sun.
What is a comet?
400
When the sun is farthest north or south of the equator.
What is a solstice?
400
An object will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force.
What is Newton's first Law of Motion?
400
Occurs when the moon passes directly between Earth and the sun
What is a solar eclipse?
400
Flat, dark parts of the moon's surface formed by lava flows billions of years ago.
What is maria?
500
A pattern or group of stars that people imagined to represent a figure, animal, or object.
What is a constellation?
500
When the noon sun is directly overhead at the equator.
What is the equinox?
500
Every object in the universe attracts every other object.
What is the law of universal gravitation?
500
Occurs at a full moon when the Earth is directly between the moon and the sun.
What is a lunar eclipse?
500
The range (in Celsius) of the various surface temperatures on the moon.