Transcript Different Types of Rocks

Types of Rock
Chapter 5
 Igneous
 Sedimentary
 Metamorphic
Igneous Rock
 Formed when volcanoes erupt, causing
the magma to rise above the earth's
surface.
 When magma appears above the earth,
it is called lava.
 Igneous rocks are formed as the lava
cools above ground.
Igneous Rock
Formation
Igneous Rock
 Granite (underground)
 Pumice (above
ground…Volcanic Rock)
 Obsidian (like glass!)
Sedimentary Rock
 rock that has been broken down into
smaller parts called sediments.
 Sediments such as sand, silt, clay and
glacial till.
 For thousands, even millions of years,
little pieces of our earth have been
eroded--broken down and worn away
(erosion)….
Sedimentary Rock
 by wind, glaciers and water.
 These little bits (sediments) of our earth are
washed downstream where they settle to the
bottom of the rivers, lakes, and oceans.
 Layer after layer of eroded earth is
deposited on top of each.
 These layers are pressed down more and
more through time, until the bottom layers
slowly turn into rock.
Sedimentary Rock
Sandstone
Shale
Limestone
Gypsum
Metamorphic
 Metamorphic rocks are rocks that have
"morphed" into another kind of rock.
 These rocks were once igneous or
sedimentary rocks.
 The rocks are under tons and tons of
pressure, which fosters heat build up and
this causes them to change.
 Causing rock to melt again forming
metamorphic rock.
 This type contains valuable minerals.
Metamorphic
Marble (from limestone)
Quartzite
Gneiss
Slate
The Rock Cycle
The Rock Cycle
Heat, Melting, Pressure
Igneous Rock
 Granite (underground) (#10)
 Pumice (above ground) (No
number…Volcanic Rock)
 Obsidian (like glass! #51)
Sedimentary Rock
Sandstone (#16)
Limestone (#18)
Shale (# 17)
Gypsum (#32)
Metamorphic
Marble (from limestone #23)
Quartzite (#22)
Gneiss (#19)
Slate (#21/39)