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Rocks

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Rocks Notes Processes that form rocks: Melting: Heating in the Earth causes rocks to melt forming magma (melted rock beneath the Earth s surface). – PowerPoint PPT presentation

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Title: Rocks


1
Rocks
  • Notes

2
Processes that form rocks
  • Melting
  • Heating in the Earth causes rocks to melt forming
    magma (melted rock beneath the Earths surface).
  • Cooling Hardening
  • Magma rises to the surface, cools and hardens.
  • Weathering, Erosion and Deposition
  • Weathering breaks down rocks into sediment.
  • Erosion is the movement of that sediment.
  • Deposition is the process where the sediment is
    dropped off.

3
Processes that form rocks
  • Compacting Cementing
  • Cementation is when sediments are glued together
    to form a rock. Pressure packs sediment
    together, cementing minerals together.
  • Compaction is when sediments are pressed together
    through pressure
  • Heat Pressure
  • Heat from magma and pressure from overlying rock
    squeezes minerals changing rocks.

4
Types of Rocks
Igneous Rock Forms from magma or lava (melted
rock on the Earths surface), melted rock.
Granite Diorite
  • When it cools above ground it cools faster
    forming extrusive igneous rock (ex. granite).
  • When it cools underground, it cools slower,
    forming intrusive igneous rock

Pumice Obsidian
5
Types of Rocks
  • Sedimentary Rock
  • Formed from sediment that has become compacted
    and cemented together.
  • Sediments are small pieces of material broken off
    rocks.
  • When rocks are deposited in layers and they are
    compacted and cemented together, they form strata
    (a layered/striped look).
  • Examples - Limestone, conglomerate and
    sandstone.

Conglomerate
Sandstone
http//www.physicalgeography.net/fundamentals/10f.
html
6
Types of Rocks
  • Metamorphic Rock
  • Form from other rocks being heated and put under
    pressure.
  • Rocks undergo metamorphosis, not melting.
  • Example - Marble

Gneiss
Marble
http//www.physicalgeography.net/fundamentals/10f.
html
7
Rock Cycle
8
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9
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10
Rock Cycle
http//rst.gsfc.nasa.gov/Sect2/rock_cycle_800x609.
jpg
11
Rock Cycle
http//www.victoria-sponge.com/media/ROCK20CYCLE
20diagram20websm.jpg
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