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The Earth in Space
Science Lesson 2
Term | Definition |
---|---|
Why do we have seasons? | Seasons are the result of the Earth's tilted axis and the rotation around the sun. The Earth's distance from the sun is always the same. |
How does the Earth move? | Earth moves in space 2 ways rotations and revolution. |
Rotation | Movement of Earth on it's axis. It causes day and night and takes Earth about 24 hours to rotate once. |
Axis | The imaginary line that passes through the Earth's center and the North and South poles. |
Revolution | Movement of Earth around the sun. One revolution of the Earth around the sun takes one year. |
What causes areas of cold and warmth on Earth? | Because the middle of the Earth (by the equator) gets the most direct sunlight(heat). |
When do we have summer in Northern Hemisphere? | When the sun tilts toward the Sun, we get direct sunlight. The Southern hemisphere is experiencing winter. |
How do we get Winter in the Northern Hemisphere? | That happens when our Northern hemisphere tilts away from the sun. The Southern hemisphere is experiencing summer. |
The Winter solstice | is the shortest day of the year. It occurs on about December 21 & marks the beginning of winter. |
The Summer Solstice | is the longest day of the year. It occurs on about June 21 and marks the beginning of summer. |
Equinoxes | When the noon sun is directly overhead at the equator. |
Vernal Equinox | occurs about March 21 & marks the beginning of spring. |
Autumnal Equinox | occurs about September 21 & marks the beginning of fall. |
What degree is the Earth tilted at? | The Earth’s axis is TILTED 23.5 degrees |
Orbit | the path of an object as it revolves around another object in space. |
Calendar | a system of organizing time that defines the beginning , length, and divisions of a year. |
Solstice | either of the two days of a year on which the sun reaches its greatest distance north or south of the equator. |
Equinox | When the sun is farthest north or south of the equator. |
Why is it generally warmer near the equator than it is near the poles? | Near the equator, sunlight hits Earth's surface directly from almost overhead. Near the poles, sunlight is indirect and arrives at a steep angle. As a result, it is warmer near the equator and colder near the poles. |
The shortest of the year in the Northern Hemisphere occurs on December 21, Why does the coldest day of the year occur in February ? | It takes time for the Earth to cool from the warmer months. |
The longest days of the year in the Northern Hemisphere occurs on June 21, Why does the warmest day of the year occur in August? | It takes time for the Earth to warm from the cooler months. |
What causes Earth to have days and nights? | The movement/spinning of Earth on its axis. |