What is the difference between sedimentary, igneous & metamorphic rocks?
Sedimentary rock is created as follows: 1. A rock (any type) is eroded by some means. 2. That eroded material is carried (wind or water), and is eventually deposited someplace. 3. Over time more and more layers of sediment (which can also be hard animal remains) is deposited over the previous layer. 4. As the pressure of the above layers increase, the particles become “glued” together. This is because of changes in the molecular structure, which creates a weak bond between the particles of sediment. Igneous rock is formed by the hardening of lava or magma. When lava cools on the surface, an extrusive rock is formed. The most common is basalt. If magma cools inside the earth, an intrusive rock forms, of which granite is most common. Metamorphic rock forms when rock is subjected to extreme the heat and pressure that occurs deep within the Earth’s crust. These conditions will cause new minerals to form in the rock, and change the size and shape of the grains. This changes its appearance a
