Orbit  - to move around something in a circular path., Collided - hit each other with force., Debris - pieces of something that are left after it has been broken or destroyed., Accumulated - gathered together over time., Natural satellite - a moon or other object that orbits a planet., Diameter - the distance across a circle or sphere., Iron-rich core  - the center part of the moon made mostly of iron., Mantle  - the layer between the core and the crust., Crust - the outer layer of the moon., Magnesium - a type of metal found in the moon’s minerals., Geologically active - having volcanoes, earthquakes, or other movements inside the planet or moon., Magma - hot, melted rock found inside a planet or moon., Traces - small amounts., Meteoroids - small rocks or pieces of metal that move through space., Comets - balls of ice, rock, and dust that orbit the sun., Asteroids - small rocky objects that orbit the sun., Crater - a large hole on the surface of a planet or moon caused by an impact., South Pole-Aitken basin - a very large crater on the moon., Illumination - the light that shines on something., Lunar phases - the different shapes of the moon we see from Earth as it moves.,

Moon 101 | National Geographic

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