Earth's surface is reshaped 95% by weather, about 4.995% by what we'll very clumsily call "crustal incidents", and .005 by interplanetary phenomena (Meteor Crater in Arizona).
The Gravity becomes less
it cools and becomes igneous rock
Granite becomes Sandstone when water erodes the Granite on Earths surface, and then deposits the sediment.
100
70% or 80% of water covers the earths surface
Yes, magma tends to rise towards the earth's surface. It does so because once melted it becomes less dense.
No the crust covers earths surface
to draw the earths surface.
The tectonic plates below earths surface shape earths landforms
There are almost no extrusive rocks on the earths surface because they are all under the earths surface. They are mainly lower than the earths surface.
Gravity doesn't become zero at equator, its value is roughly the same all over the earths surface.
Weathering and erosion shape earths surface by changing earths surface by having extreme forces that change earth.