| A | B |
|---|
| rotation | spinning on an axis, causes day and night |
| revolution | the movement of one object around another, takes a year |
| neap tide | when the Sun, Earth and Moon make a right angle and the high tides are lower than usual and the low tides are a little higher than usual. |
| spring tide | when the Sun, Earth, and Moon are lined up and high tides are higher and low tides are lower. |
| axis | imaginary line that passes through the Earth's center from the North to the South |
| orbit | Earths elliptical path as it revolves around the sun |
| tide | the rise and fall of Earth's water |
| lunar cycle | A sequence of phases of the moon as it revolves around the Earth once every 29.5 days. |
| season | short period of climate change in an area caused by the tilt of Earth's axis as Earth revolves around the sun. (winter, summer, autumn, spring) |
| equinox | in spring and fall and the Earth has equal day and night; the sun's direct light is closest to the equator |
| solstice | In summer and winter and the Earth has the longest day/shortest night or the shortest day/longest night |
| spring | Earth is not tilted toward or away from the Sun. This season comes after winter. |
| fall | Earth is not tilted toward or away from the Sun. This season comes after summer. |
| summer | The Northern Hemisphere of the Earth is tilted in toward the sun. |
| winter | The Northern Hemisphere of Earth is tilted away from the sun. |
| ellipse | The shape of Earth's orbit |
| lunar eclipse | when the shadow of Earth falls on the moon |
| solar eclipse | when the moon comes between Earth and the sun |
| 23.5 degrees | the angle of tilt of Earth's rotation |
| equinox | when the sun's direct light is closest to the equator |
| counter clockwise | the direction of Earth's orbit of the sun |
| moon phases | The changing appearances of the Moon as seen from Earth |
| Tropic of Cancer and Capricorn | 23.5 degrees north and south of the equator |
