Download Igneous Rock PPT - Effingham County Schools

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Age of the Earth wikipedia, lookup

Pedosphere wikipedia, lookup

Provenance (geology) wikipedia, lookup

Weathering wikipedia, lookup

Basalt wikipedia, lookup

Marine geology of the Cape Peninsula and False Bay wikipedia, lookup

Composition of Mars wikipedia, lookup

Mackenzie Large Igneous Province wikipedia, lookup

Algoman orogeny wikipedia, lookup

Clastic rock wikipedia, lookup

Geology wikipedia, lookup

Geochemistry wikipedia, lookup

Large igneous province wikipedia, lookup

Transcript
Igneous Rocks
Igneous
Metamorphic
Sedimentary
3 types of rocks

Igneous rocks are formed from molten
rocks that has cooled and hardened.
Ship Rock, New Mexico
Formed when magma in a volcano cooled slowly
Igneous Rocks

Magma (or Lava) cool and crystallize to
form igneous rock.
Igneous Rocks

There are two
types of Igneous
Rock. Intrusive
and Extrusive
Igneous
Rocks

Extrusive Igneous Rock is formed from
lava, which is on the surface.

Intrusive Igneous Rock is formed from
magma, which is below the surface.

What is the difference between magma
and lava? Lava is on the earth surface
and magma is below.

Molten rock that flows on the surface of
the Earth is lava.

Molten rock that is below the surface of
the Earth is Magma.

Intrusive— large crystals
◦ WHY? The inside of the Earth is VERY hot!
Therefore, the magma cools slowly creating
larger crystals

Extrusive— small crystals
◦ WHY? Earth’s surface is much cooler, and
lower temperatures mean rocks cool quickly,
not leaving enough time for large crystals to
form.
Textures of Igneous Rocks

Igneous rocks are dominated by silicate
minerals.
Silicates

Molten rock with lower amounts of silica
flows faster than molten rock with higher
amounts of silica.

If lava has more silica, it will move slower
than lava with less silica.
Lava spread = small amounts of silica
Explosive eruptions = large amounts of silica
Extrusive Igneous Formations

Where are many Igneous Rocks found?
Divergent boundaries and volcanoes.

Igneous rock undergoes weathering (or
breakdown) to form sediment.

So it becomes……………………
◦ Sedimentary Rock
The Rock Cycle

Of the following three types of rocks,
igneous rocks are the hardest.
Igneous Rocks
Stone Mountain

The Stone Mountain granite is a relatively
small granite pluton that covers an area
less than a county in size.
Stone Mountain

Stone Mountain is made of granite and is
an igneous rock.
Stone Mountain

Magma that cools and hardens forms an
intrusive igneous rock

Lava that cools and hardens forms an
extrusive igneous rock