a compass
Scientists have observed the movement of stars in the sky to determine that the Earth is moving around the Sun, rather than the other way around. This is known as the heliocentric model, proposed by astronomer Nicolaus Copernicus in the 16th century.
They don't know, they just guess
they were first on earth
The planet s that have ice on their poles are earth mars, and no others that we know of now
Since the earth is spinning ... an object on the equator is moving roughly 1,000 miles per hour ... the earth is somewhat bulged at the equator. Its diameter at the equator is a little larger than the distance between the north and south poles. For that reason, when you stand at the pole, you're a bit closer to the center of the earth than when you stand on the equator. The farther you are from the center of the earth, the lower the force of gravity between you and the earth. So the force is less at the equator and more at the poles.
earthquakes
by the winter or summer
nothing, as far as I know. The earth isn't moving slow, it's moving extremely fast.
We may possibly know how Earth was created.
By carbon dating minerals, fossils or objects, in the earth.
not a clue
The nMoon was once a part of the Earth, so it is the same age as the earth.