Geology Rocks

1.The 3 types of rock are called igneous,sedimentary and metamorphic.

Igneous:Igneous rock is one of the three main rock types, the others are sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava.

Sedimentary:Sedimentary rocks are types of rock that are formed by the deposition and subsequent cementation of that material at the Earth’s surface and within bodies of water.

Metamorphic:A metamorphic rock is a type of rock which has been changed by extreme heat and pressure.

A)The way to identify the rocks Metamorphic,Sedimentary and igneous are by the way they feel,Each rock has its own significant feel to it.Metamorphic rocks feel rough,Sedimentary rock feel hard and smooth and Igneous rocks feel bumpy.

B)A real life example of of Metamorphic,Sedimentary and Igneous rocks are normally used at front door gardens.

C)Sedimentary rocks are made when sand,mud and pebbles form layers.Igneous rocks are formed by the Extrusive igneous rocks form when the magma or molten rock pours out onto the earth’s surface or erupts at the earth’s surface from a volcano,Metamorphic rocks are formed by the heat and pressure.

D)Igneous rocks are made by volcano’s,Sedimentary rocks are made by The material at the earths surface and metamorphic rocks are mad by the heat and pressure.

E)They are commonly used for building material and decoration.

2.The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals.

3.Weathering is the breakdown of rocks at the Earth’s surface, by the action of rainwater, extremes of temperature, and biological activity. It does not involve the removal of rock material. There are three types of weathering, physical, chemical and biological.

4.The size of crystals in an igneous rock is an important indicator of the conditions where the rock formed. An igneous rock with large crystals probably indicates that the rock formed deep within the Earth, since it is typically warmer deep inside the Earth than near the surface.