this presentation tells the types of rocks and their descriptions

1. ROCKS

2. TYPES OF ROCKS
 IGNEOUS ROCKS
IGNEOUS ROCKS
SEDIMENTARY ROCKS
SEDIMENTARY ROCKS
METAMORPHIC ROCKS
METAMORPHIC ROCKS

3. IGNEOUS ROCKS
 Igneous means “made from fire or heat”.
 Igneous rock is formed when magma from
deep inside the Earth forces its way out and
reaches the Earth‟s surface.
 Magma- molten or liquefied rock

4. TWO KINDS OF IGNEOUS ROCKS
 EXTRUSIVE IGNEOUS
 This forms when magma comes to the surface and
cools quickly.
 The slower the rocks cool down, the larger the
crystals that are formed.

5. TWO KINDS OF IGNEOUS ROCKS
 INTRUSIVE IGNEOUS
 Itis formed when magma hardens or cools slowly
inside Earth.
 Slowly cooling magma forms coarse-grained rocks.

6. EXAMPLES OF IGNEOUS ROCKS
 Granite
 Basalt
 Pumice
 Obsidian
 Peridotite
 Gabbro
TYPES OF ROCKS

7. SEDIMENTARY ROCKS
 Made from pieces of rocks and minerals called
sediments which form in layers
 The particles were buried, compressed and
cemented to a solid mass.
 Lithification- the process that turns the loose
sediments in the bottom of the sea or river bed
into hard sedimentary rocks

8. EXAMPLES OF SEDIMENTARY ROCKS
 Shale
 Limestone
 Sandstone
 Coal
 Breccia
 Flint
TYPES OF ROCKS

9. METAMORPHIC ROCKS
 Metamorphic means „change in form‟
 Either sedimentary or igneous rocks that
become different in color, hardness and in
other ways because of their exposure to heat
and pressure

10. EXAMPLES OF METAMORPHIC ROCKS
 Marble
 Slate
 Schist
 Gneiss
 Quartzite