1.what is gravity?(in your own words) 2.How does gravity cause the planets to move in a circle around the sun?

1.gravity is um how di say this in my words um i think gravity is the stuff that hold  you on the ground

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Explanation:

2.The sun's gravity pulls the planet toward the sun, which changes the straight line of direction into a curve. This keeps the planet moving in an orbit around the sun. Because of the sun's gravitational pull, all the planets in our solar system orbit around it.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.