Geology Rocks

1
Geology Rocks!!!
2
What are rocks?

• What are rocks?

A naturally occurring solid mixture of crystals
of one or more materials (minerals).
3

• Rocks are have been used for

Early tools (hammers) used to make other rocks
(arrowheads, spears points, knives, scrapers).
4
Building Materials for Buildings, Monuments and
Roads (Granite, Limestone, Marble, Sandstone,
Slate).
5
Used to Make Cement and Plaster
6
Rocks are Always Changing
What causes rocks to change?
7
Weathering water, wind, ice and heat break down
rock into fragments that make sedimentary rock.
8
Erosion Sediment is removed from its source.
Weathering can produce erosion.
9
Deposition The process by which sediment moved
by erosion is dropped and comes to rest.
10
Processes that Make Destroy Rock The Rock Cycle
11
If the temperature and pressure are high enough
the Sedimentary rock can turn to Metamorphic
rock. If hot enough it can even melt! The
melting creates magma which cools and forms
Igneous Rock.
How Rock Forms
12
Sedimentary Rock

• Sand comes from weathering. Over time sand may be
  compressed and then cemented together to form
  Sandstone (One type of Sedimentary rock).
• Through weathering and erosion, sediment is moved
  and deposited in layers. It does not need heat or
  pressure to form.
• Forms rock layers known as strata.
• Examples Sandstone, shale, dolomite

13
Meta is the Greek word for Changed. Morphos
means Shape. All 3 types of rock can be
changed by heat, pressure, or a combination of
both. Metamorphism occurs from 50C 1,000
ºC. Examples include marble, slate and gneiss.
Metamorphic Rock
Just add heat and pressure!
14
Igneous Rock

• Igneous comes form the latin word that means
  fire. Forms when hot, liquid rock (magma),
  cools. Examples Granite, Basalt, Rhyolite

Mr. Flory explores a cooled igneous rock lava
flow.
Devils Tower Wyoming
15
THE ROCK CYCLE!(It Rocks!)