ROCKS
ABOUT A hard substance formed by the combination of one or more minerals is called rock. TYPES (1) IGNEOUS ROCK The word igneous comes from the Latin word 'ignis' meaning 'fire'. Magma is extremely hot molten material found deep inside the earth. This magma cools down just below the earth's surface. It then hardens to form igneous rocks.Even sometimes, when the volcanoes erupt, they throw out lava. This lava als hardens to form igneous rocks. It is classified as : * Intrusive igneous rock * Extrusive igneous rock (2) SEDIMENTARY ROCKS ...