What happens to create hard marble?

Question

Soft marble: the minerals are dominated by
calcium carbonate. Hard marble: the minerals are dominated by calcium silitates. What must have happened to create the hard marble?

Answer 1

i can't fully remember but it has a lot ot do with the amount of pressure and heat that the rock is subject to and the starting rock type. Marble starts off as a soft chalk or harder limestone (CaCo3). This is then subject to being put under pressure by earth movement or burial. It also heated due to pressure or even due to undergroud heat from a magma source or hydrothermal water. The amount of heat and pressure and the length of time will create different rocks. Also the starting type of rock can vary.This heat and pressure like baking a cake can physically alter the minerals in the rock. When you then think that the water perculating through the rock can contain other elements which alter the chemical composition of the rock. As a very simple analogy imagine getting snow and squeezing it tight you then get a hard snowball. The harder you squeeze the harder the snowball. There is along list of chemical equations that go with it that i'm sure you can get from any enyclopedia or hopefully some one here may supply you with :-)

Answer 2

I think that they dumped sand on the Earth.The Earth was still hot---like a sun.They kept dumping sand till it cooled.Then it was Pyramids.The rooms inside of the Pyramid produced water vapor.The openings in the Pyramids vented the moisture.After the oceans formed it was dandelions.