Within the rock cycle rocks can be weathered to small rock and mineral grains.
These grains could then be carried away by wind, water, or ice.
This is what we call erosion . This does not mean that the minerals and chemical elements that make up rock are destroyed.
The elements that make up rocks are not destroyed they are just redistributed in other forms.
Igneous Rock Section 4-2 H.W. pg. 97 questions 1-4
Igneous rock forms when magma cools and hardens.
At certain within the Earth, the temperature and pressure are just right for rocks to melt and form magma.
Magma can be located at depths of 150km below the Earths surface. The temperature of this magma can range between 650- 1,200 o C, depending on their chemical compositions and pressures exerted on them.
Depending on the amount of pressure and temperature applied, one type of rock can change into several different metamorphic rocks, and every metamorphic rock can come from several different parent rocks.
Ex: The sedamentary rock shale will change into slate.
As you increase pressure slate turns into phyllite, then schist and then eventually gneiss.