Internal Forces Shaping the Earth The earth’s crust consists of number of tectonic plates.
-
Upload
barbara-allison -
Category
Documents
-
view
221 -
download
2
Transcript of Internal Forces Shaping the Earth The earth’s crust consists of number of tectonic plates.
• The crust is broken into different ‘plates’• These parts of
the Earth's crust slowly drift atop a liquid mantle
Types of boundary movements:
• Divergent – plates move apart, spreading horizontally• Convergent – Plates collide, causing
either one plate to dive under the other or the edges of both plates to crumple• Transform – plates slide past each other
YouTube Video
• http://www.youtube.com/watch?v=ryrXAGY1dmE
Volcanoes –a mountain with a crater through which lava, rock fragments, hot vapor, and gas are being or have been
erupted from the earth's crust.
Volcanic Eruptions• Lava – magma that has reached the earth’s
surface• Most volcanoes erupt with volcanic ash,
which makes the area great for farming.• The volcanic ash can also create it’s own
weather
Hot Spots•narrow stream of hot mantle coming up from the mantle through the crust.•Creates chains of volcanoes as the plate moves across the hot spot.•These volcanoes are not on plate boundaries
•Example-Hawaiian Islands, Galapagos Islands
The Ring of Fire• The most active
volcanic and earthquake zone on earth• The Ring of Fire has
452 volcanoes and is home to over 75% of the world's active and dormant volcanoes.
Earthquake - Violent movement of the earth as the plates grind or slip past each other at a fault
YouTube Video:
http://www.youtube.com/watch?v=xyKgamjegtQ