My teacher has told me to tell you about minerals, Igneous rocks, Sedimentary rocks, and Metamorphic rocks from my science book, so here it is.
Do you know what minerals are? A mineral is a solid, nonliving substance that occurs naturally in rocks or in the ground. Here are some examples of minerals. Hornblende is one of a group of hard green, black, and brown minerals. Silvery galena is a common mineral from which we get lead. Copper is produced from the mineral chalcopyrite. Rock can be made of many minerals or of one mineral with different- sized grains. Can you believe that there are more than 4,000 kinds of minerals?! It’s hard to believe but it’s true. Many kinds of minerals are alike. Gypsum and calcite may look alike but gypsum is easier to scratch. Now let’s talk about Igneous rocks!
Do you know how Igneous rocks form? Igneous rocks form when melted rock cools and hardens. Igneous rocks usually form from volcanoes because volcanoes have magma and lava. Here are some Igneous rocks: Basalt, Rhyolite, Gabbro, Diorite, and Granite. Deep inside the earth, it is so hot that some rock is liquid, like syrup. This melted rock is magma. Magma is inside earths crust. Now let’s talk about Sedimentary rocks.
Sedimentary rocks form from sediment. Sediment is pieces of rock that have been broken down and moved. Sedimentary rocks are very common on earths surface. For instance, you could see one in your backyard or in a park. You could see them almost anywhere. Another group of rock is metamorphic rock. Metamorphic rock is rock that has changed from another type of rock. High temperature can change one type of rock into metamorphic rock.
That’s just about all I wanted to tell you. Hope you liked it!