We will be discussing rocks in much more detail over the next couple of weeks, but in order to have today's lecture make much sense, you need a little background. Some of this may well be review for some of you. Igneous Rocks which form through the solidification of molten rock material. Sedimentary Rocks which form from sediments which have been eroded from other rocks. Today we will be mostly concerned with igneous rocks, so let's focus a bit on that.
Igneous rocks are rocks which form from cooling magma or lava.
Magma Molten or partially molten rock material and dissolved gases. Magma is molten rock beneath Earth's surface. Lava Molten or partially molten rock material and dissolved gases. Lava is molten rock which has erupted at Earth's surface. Texture is an umbrella term which includes different aspects of how rocks look.