The gravity model was created by Newton.
The spinning of Earth on its axis is Earth's rotation.
Tectonically stable means that this part of the continent has not moved for billions of years. The rock formation is important understanding the history of Earth since its unmoved and untouched state can provide ideas about how the Earth looked like as seen on the layers of the rock formation.
"George gets candy if Bob does his homework"
The best answers for this questions would be:
B. To identify stars which are the same distance from Earth.
<span>This astrological signs help the research of the astronomers discover the distance of the earth. They named it, in order to keep track of the stars.</span>
