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Introduction to Rocks

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Introduction to Rocks 7th grade science What are rocks? Rocks are a combination of minerals Are all rocks the same? No Not only are they different colors, but there ... – PowerPoint PPT presentation

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Title: Introduction to Rocks


1
Introduction to Rocks
  • 7th grade science

2
What are rocks?
  • Rocks are a combination of minerals

3
Are all rocks the same?


  • No
  • Not only are they different colors, but there are
    also different types
  • The three main types are igneous, sedimentary,
    and metamorphic rocks.

Igneous Granite
Metamorphic Gneiss
Sedimentary Sandstone
4
Where do rocks come from?
  • Rocks are created, transformed, and destroyed in
    a process called the rock cycle
  • Interactive Rock Cycle Animation

http//www.cotf.edu/ete/modules/msese/earthsysflr/
rock.html
5
The rock cycle Part 1
  • First of all there is no real beginning or end to
    the rock cycle.
  • However, for this lesson we will begin with
    igneous rocks.
  • Igneous rocks often forms when lava erupts from
    volcanoes then cools.

6
Igneous Rocks


  • Can be
  • Shiny
  • Crystalline
  • Porous

http//geology.about.com/library/bl/images/blrocki
ndex.htm
7
The rock cycle Part 2
  • Secondly, the rock cycle is not a perfect circle,
    it does not occur in a specific sequence.
  • Igneous rocks can be re-melted, eroded, or
    pressed.
  • Rocks that are formed from eroded sediment are
    Sedimentary Rocks.

8
Sedimentary Rocks


  • Can be
  • Grainy, Sandy
  • Made of different pieces of rocks or minerals
  • Striped

9
The rock cycle Part 3
  • Finally, rocks can be transformed over time to
    make new rocks.
  • Heat and pressure can create new rocks
  • These rocks are called Metamorphic rocks.

http//www.tulane.edu/sanelson/geol111/metamorphi
c.htm
10
Metamorphic Rocks


  • Come in a variety of styles, shapes and colors
  • Many have stripes, but not all
  • Many contain unique crystal and mineral
    formations only unique to metamorphic rocks

11
Review
  • There are review questions about rocks on the
    following slides.
  • In order to progress through the quiz in the
    correct order you have to click the links on the
    slides.
  • Click the Begin Quiz link on this page to start
    the quiz.
  • Begin Quiz

12
1. True or False The rock cycle always starts
with igneous rocks and ends with metamorphic
rocks.
  1. True
  2. False

13
Correct! Click to Continue
14
Sorry, Try again. Click to Continue
15
2. True or False The rock cycle does not always
follow the same order.
  1. True
  2. False

16
Correct! Click to Continue
17
Sorry, Try again. Click to Continue
18
3. Igneous rocks
  1. Can be formed from pieces of sediment that have
    been compacted and glued together.
  2. Can be formed from molten magma or lava.
  3. Are formed when heat and pressure transform old
    rocks into new rocks.

19
Correct! Click to Continue
20
Sorry, Try again. Click to Continue
21
4. Sedimentary rocks
  • Can be formed from pieces of sediment that have
    been compacted and glued together.
  • Can be formed from molten magma or lava.
  • Are formed when heat and pressure transform old
    rocks into new rocks.

22
Correct! Click to Continue
23
Sorry, Try again. Click to Continue
24
5. Metamorphic Rocks
  • Can be formed from pieces of sediment that have
    been compacted and glued together.
  • Can be formed from molten magma or lava.
  • Are formed when heat and pressure transform old
    rocks into new rocks.

25
Correct! Click to Continue
26
Sorry, Try again. Click to Continue
27
The End
28
References
  • http//www.cotf.edu/ete/modules/msese/earthsysflr/
    rock.html
  • http//geology.about.com/library/bl/images/blrocki
    ndex.htm
  • http//www.tulane.edu/sanelson/geol111/metamorphi
    c.htm
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