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Earth, Moon & Space

axis The imaginary line that passes through Earth's center and the North and South poles
rotation The spinning motion of a planet around its axis
revolution The movement of one object around another object
orbit The path of an object as it revolves around another object in space
day Each 24 hour cycle of day and night
astronomy The study of the moon, stars and other objects in space
What causes day and night? Earth's rotation on its axis
Why does Earth have seasons? The Earth's axis is tilted as it moves around the sun
solstice The 2 days of the year when the sun is overhead at 23.5 degrees North or South (longest or shortest days of the year)
equinox Days and nights are exactly the same length because neither hemisphere is tilted away from the sun
How is the Northern Hemisphere titled in relation to the sun when it is summer? The Northern Hemisphere is tilted towards to the sun
Why is it warmer near the equator? At the equator sunlight hits Earth's surface directly and is less spread out.
How does the moon move? The moon revolves around the Earth and rotates on its own axis.
What causes the different phases of the moon? The positions of the sun, moon, and Earth and how they line up.
How often does the moon go through a whole set of phases? Around once a month or each time the moon revolves aroudn the Earth
Describe a New Moon The side of the moon facing Earth is dark
Describe a First quarter Half of the side of the moon facing Earth is lighted
Describe a Full Moon All of the moon facing Earth is lighted
Describe a Third quarter Half of the side of the moon facing Earth is lighted
When does an eclipse occur? When the moon's shadow hits Earth or Earth's shadow hits the moon
What is a solar eclipse? When the moon blocks sunlight from reaching Earth
What is a lunar eclipse? When Earth blocks sunlight from reaching the moon.
What is the arrangement of the Earth, moon, and sun during a lunar eclipse? Earth is directly between the moon and the sun.
What are tides? The rise and fall of ocean levels.
Why do tides occur? Differences in how much the moon pulls on different part of the Earth (gravity)
Describe the moon It contains craters, highlands and maria
Created by: jmebuckley