Goldilocks Planet - One of Earth's nicknames, Diameter - a straight line passing from one side to side through the center, Equator - An imaginary line that divides Earth into two halves, Northern Hemisphere - North half of the Earth, Southern Hemisphere - Southern half of the Earth, North Pole - Northernmost point on the Earth, South Pole - Southernmost point on Earth, Orbits - A repeated path that one object in space takes around another one, Perihelion - Earth is nearest to the sun in January, Aphelion - Earth is farthest from the sun in July, Axis - An imaginary straight line that something (such as the Earth) turns around, Continuous - to do something without stopping, Satellites - an object placed in orbit around the Earth, moon, or other planet that collects information or is used for communication, Earth System Science - The study of interactions between and among Earth's different parts, Famine - Extreme lack of food, Essential - absolutely necessary; extremely important,

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