A rock is defined as any solid mass of minerals or mineral-like matter that occurs naturally. Minerals can be found naturally in rocks, or can form from the breakdown of existing rocks or be chemically produced. There are three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks form from the cooling of magma either underground as intrusive rocks or on the surface as extrusive rocks. Sedimentary rocks form by the compaction or cementation of sediments such as sand, gravel and minerals. Metamorphic rocks form from the alteration of existing rocks through heat, pressure and chemical processes within the earth's crust.

2. What is a rock?
 A rock is any solid group of minerals or
mineral like matter that has occurred
naturally.
 Minerals can occur naturally, can come
from a rock that broke up, or can be
chemically made

3. Where are minerals found?
 Minerals can be found in:
 In mines
 Quarry’s
 Reserves

4. Igneous Rocks
 Begins as molten rock on the earths
surface and quickly cools and produces
a rock

5. Magma
 Happens from melting that occurs at
different levels with in the earths crust
 Once a magma body forms it floats to
the top and creates an igneous rock
 Once it reaches the earth crust it
becomes lava

6. Extrusive Igneous Rocks
 When the molten rock becomes solid at
the surface,
 It quickly cools and produces fine
grained rocks, and mineral crystals you
can’t see

7. Intrusive Rocks
 When magma stops forming inside the
earth
 It begins to slowly cool.

8. Metamorphic Rocks
 Process of change that causes mineral
content, texture, and chemical
composition all to change in some way

9. What causes
Metamorphism?
 Usually formed when new conditions
arise

10. Sedimentary Rocks
 Sediments that form together to make a
rock
 3 different types of sedimentary rocks

11. Detrital Sedimentary Rocks
 Gathering of particles that come from
mechanical and chemical weathering

12. Chemical Sedimentary
Rocks
 Dissolved particles that come from
chemical weather (Acid rain)
 Begin dissolved in water and come
together over time to form something

13. Organic Sedimentary Rocks
 Most common example is Coal
 Forms from Carbon that is left on our
planet that died many years ago
 Examples…

15. Works Cited
 The Planet Really Rocks. 2000. Oracale Think Quest. Web. 13
Oct. 2012.
 Rietze, Martin. Krakatoa. 2010. Private collection . Web. 13 Oct.
2012.
 Study Droid
 Bitesize. BBC, Feb. 2010. Web. 13 Oct. 2012
 Bryant, Ann. Geology Today. N.p., Mar. 2010. Web. 13 Oct.
2012.
 Metamorphic rock. 2011. Geology Today . Web. 13 Oct. 2012.
 Detrital sedimentary Rocks. 2011. Private collection . Web. 13
Oct. 2012.
 The Rock Cycle. 2012. Private Collection . Web. 13 Oct. 2012.
 Time to End the War on Coal. 2010. Web. 13 Oct. 2012.