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# What shape is the Earth’s orbit?

## Presentation on theme: "What shape is the Earth’s orbit?"— Presentation transcript:

What shape is the Earth’s orbit?
The Earth’s orbit around the sun is shaped like an ellipse. A circle (for the most part). Ex: If the orbit is a circle, what causes the seasons?

How does sunlight strike the Earth’s surface?
Near the equator, sunlight strikes Earth’s surface more directly and is less spread out than near the poles. Please draw this picture in your notes.

What causes the seasons?
Earth has seasons because Earth is tilted as it revolves around the sun – not because it is closer to or farther from the sun! How much is it tilted?

What is equinox and solstice?
Equinox = neither end of Earth’s axis is tilted toward the sun. Solstice = North or south end is tilted toward the sun.

What is gravity? Gravity is a force that attracts all objects toward each other.

What determines the strength of gravity?
The strength of the force of gravity between two objects depends on two factors: the masses of the objects and the distance between them.

What is the law of gravitation?
Every object in the universe attracts every other object.

If gravity is constantly pulling, what keeps the moon in orbit?
Newton concluded that two factors–gravity and inertia–combine to keep the moon in orbit around Earth. Dance, Dance (Gravity and Inertia)

What is inertia? The tendency of an object to resist a change in motion. Shoebox and eraser demo

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