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Geology Presentation by Bradley & Duncan

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duncan farrow

on 13 February 2014

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Transcript of Geology Presentation by Bradley & Duncan

Geology Presentation
Minerals
- A mineral is not a rock.

- It is natural reoccurring
material..
How they're formed
What is igneous?
Having solidified from lava or magma.
Igneous means
relating to or involving volcanic processes.
Igneous rock
Pangaea Theory
- Based off the works of Alfred Wegener in the 20th century.
The Movement of the
Continents
- The continents started moving from the Permian period to the Present Day.
Present Day
- The continents are now in their present day locations but they have not stopped moving yet.
The Beginning
- Earth formed about 4.7 billion years ago.
Volcanoes
What are they made of?
- They're made out of hardened lava or molten rock.
How do they grow?
- Volcanoes grow by intrusion.
How do eruptions occur?
Pyroclastic Flow
- Pyroclastic flow is a moving current of hot gas and rock which comes flowing in at a speed of 700km/h and it can kill a person.
What are volcanoes?
- Volcanoes are mountains that have an opening at the top where lava erupts from it.
Geology
Why are there earthquakes?
There is so much pressure against both sides that they
cause devastating results.
What are
tectonic plates?
Why do they move?
The tectonic plates move because of the polarized points on the earth.
Geo meaning earth
By Bradley & Duncan
There are 4 layers in the earth.
- The intrusion in the volcano is magma that
moves up into a volcano without erupting.
- The extrusion is the eruption of the materials inside of the volcano that causes the volcano to grow from the inside.
The tectonic plates are giant plates that exert huge amounts of pressure against
each other.
Where are the tectonic plates?
Rocks
- Volcanoes erupt by extrusion.
- Igneous rock
hardens from
molten magma.
How hot is it to melt rock?
Temperatures of most magmas are in the range 700 °C to 1300 °C (or 1300 °F to 2400 °F).
Continental Drift
They are formed through the rock cycle.
- All land masses were once united in a supercontinent; continents drifted apart over many millions of years.
- Pangaea meaning: "all Earth".
What is the definition?
- It is the gradual movement of continents across the earth's surface through geological time.
- The earth itself appeared to have only one continent called Pangaea.
- The Atlantic Ocean has the mid-ocean ridge
which has lava flow about every year and
pushes out the rock around it.
- The Atlantic Ocean expands every 2 inches
a year pushing the continents with it.
Full transcript