igneous rocks around us HERMITAGE MUSEUM IN SAINT PETERSBURG RUSSIA The school bus pulls up to a huge museum Its front is covered in sculptures carved from a hard rock called granite What will you find inside the museum
ANCIENT TOOL DISPLAY OBSIDIAN KNIFE In one room you discover displays that contain more granite carvings of rocks animals and other subjects Another room is full of ancient tools made from obsidian and other rocks Igneous rocks such as granite and obsidian are all around us
what are igneous rocks Igneous rocks are one of the three main types of rock Most igneous rocks are made of one or more minerals More than half of Earth’s crust is made up of igneous rocks This makes it the most plentiful type of rock More than 700 types of igneous rocks have been identified They are found all over the world They are in mountains at the bottom of the ocean and under your feet SCORIA SUMMIT ON MAUNA KEA IN HAWAII
MORE MINERALS Scientists have identified more than 4,000 different minerals Different minerals in different amounts make different rocks BASALT COLUMNS IN TAIWAN
