Types of Rocks • Igneous Rocks • Sedimentary Rocks • Metamorphic Rocks
Igneous Rocks • They are rocks formed by solidification of the magma underneath the earth’s crust or lava on the earth’s surface • Examples : • Granite b. Basalt
Sedimentary Rocks • They are rocks formed from the fragments and decomposed products of other rocks • Examples: a. Sandstone b. limestone
Metamorphic Rocks • They are rocks originated from exposing the old rocks to heat and pressure • Example: Marble
Rock Cycle • It is the change of one type of rock to another
Earth • It is the third planet from the sun • Planet Earth is suitable for life • Due to : • Presence of hydrosphere • The presence of atmosphere • Its temperature is suitable • Its atmospheric pressure and its gravitational force
Earth’s Layers • It consists of three layers • Crust • Mantle • Core • Outer Core • Inner Core
Earth’s Layers • Crust’s thickness: 8-50 Km. • Mantle Thickness: 2885 Km. • Outer Core: 2270 Km. • Inner Core: 1216 Km.