The Earth, the Sun, and the Moon (5.8D)

The student is expected to identify and compare the physical characteristics of the Sun, Earth, and Moon.

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Vocabulary: 

Moon: A natural satellite that orbits a planet. Some planets have no moons; others have over 60 moons.

Orbit: The path one object takes as it revolves around another object in space

Craters: Bowl-shaped indents or cavities on the surface of a planet, moon, or asteroid that are caused by a collision with another object, such as a meteorite

Mass: The amount of matter in an object

Weight: The heaviness of an object; force of gravity on mass = weight

Gravity: A natural force that causes two objects to pull toward each other depending on their mass and the distance between them

Sun: The star at the center of the Solar System that supplies heat and light to Earth; its enormous gravity keeps the solar system in orbit

Earth: A planet in the Solar System that has life on it

Surface: The outermost covering or layer

Celsius: A temperature scale that sets the freezing point of water at 0º and the boiling point at 100º
 

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