c. Classify rocks by their process of formation. - PowerPoint PPT Presentation

1 / 21
About This Presentation
Title:

c. Classify rocks by their process of formation.

Description:

Sedimentary Rock c. Classify rocks by their process of formation. d. Describe processes that change rocks and the surface of the earth. – PowerPoint PPT presentation

Number of Views:104
Avg rating:3.0/5.0
Slides: 22
Provided by: Lesl138
Category:

less

Transcript and Presenter's Notes

Title: c. Classify rocks by their process of formation.


1
Sedimentary Rock
  • c. Classify rocks by their process of formation.
  • d. Describe processes that change rocks and the
    surface of the earth.

2
Sedimentary Rock
  • Formed from particles of sediment deposited by
    wind and water.
  • Sediment is small pieces of solid materials that
    come from rocks or living things.

3
Stratification
  • Yes, all these rocks are layered or stratified.

4
Weathering
  • The process by which exposed rock is broken down
    into small pieces by the elements of nature
    (wind, rain, ice, chemical actions, plants, etc.)

5
Origins of Sedimentary Rock
  • Wind, water, ice, sunlight, and gravity all cause
    rock to physically weather into fragments.
  • Through erosion, these rock and mineral
    fragments, called sediment, are moved from one
    place to another.
  • The sediment is deposited in layers, and
    eventually newer layers cover the older layers.

6
Erosion
  • Occurs when water or wind loosens rock and soil
    and carries it away.

7
Deposition
  • The process by which the sediment settles out of
    the water or air carrying it.
  • Sediment is deposited when the wind or water
    slows down.

8
Compaction
  • As the sediments settle they will loosely fit on
    top of each other.
  • As the years go by, more and more sediment is
    added.
  • The bottom layers get compacted by the weight of
    the layers above them.

9
Cementation
  • While compaction is going on, minerals in the
    rock slowly dissolve.
  • The dissolved minerals seep into the spaces
    between the compacted sediment.
  • They crystallize and glue the sediments together.

10
Lithification
  • The process by which sediment becomes sedimentary
    rock.
  • From Greek word lithos, which means rock.
  • Erosion
  • Deposition
  • Compaction

11
Types of Sedimentary Rock
  • Clastic formed when rock fragments are squeezed
    together.
  • Organic (biological) formed from the remains of
    living things.
  • Chemical formed when dissolved minerals
    crystallize.

12
Conglomerate and Breccia
  • Formed from a mixture of rock fragments of
    different sizes.
  • Conglomerate has rounded edges.
  • Breccia has larger fragments with sharp edges

13
Sandstone
  • Formed from sand on beaches, ocean floors, river
    beds, and deserts.
  • Mainly quartz.

14
Shale
  • Clastic rock formed from tiny particles of clay.
  • Water deposits tiny clay particles in thin
    layers.
  • Feels smooth and splits easily into flat sheets.

15
Organic Sedimentary Rock
  • Formed from the remains of plants and animals
    that were deposited in thick layers.
  • Also called biological rock.

16
Coal
  • Formed from the remains of ancient swamps.
  • As layer upon layer of dead plants built up, the
    bottom layers were compacted into coal.
  • Stored chemical energy

17
Limestone
  • Formed from the shells of ancient sea animals and
    plants.
  • Shells fall to the bottom of the ocean in layers,
    some 100s of meters thick.
  • Compaction creates limestone.

18
Chalk
  • Formed from the shells of ancient sea life.
  • Creates layers 100s of feet thick.
  • White Cliffs of Dover

19
Chemical Sedimentary Rock
  • Formed when water with dissolved minerals
    evaporates.
  • The left behind minerals will crystallize.

20
Halite
  • Rock Salt
  • Formed from seas and oceans that dried up.
  • The salt forms large crystals.

21
Gypsum
  • Made from calcium deposits.
  • Used to make sheet rock for homes.
Write a Comment
User Comments (0)
About PowerShow.com