8.
a. The Mid-Atlantic Ridge is formed from divergent boundary between oceanic oceanic plates it's an mid-oceanic ridge.
b. Kuril Trench is formed by a convergent boundary between oceanic continental plates it's an oceanic trench.
c. Philippine Islands are a convergent boundary between oceanic oceanic plates it's an island arc.
d. East African Rift Valley is a divergent boundary between continental continental it's a rift valley.
e. Red Sea is formed by a divergent boundary between continental continental it was formed from a rift valley.
f. Peru-Chile Trench by a convergent boundary between oceanic continental it's an oceanic trench.
g. Aleutian Islands by a convergent boundary between oceanic oceanic it's an island arc.
Wednesday, October 21, 2009
Thursday, October 15, 2009
Plate Boundaries with out number 8
1.divergent boundaries, convergent boundaries, transform boundaries
2.Divergent is when the plates are moving in opposite directions, this happens because magma is pushing up from the mantle and is creating new crust.
3.Mid-Atlantic Ridge, Iceland, Active volcano
4.Convergent is when the crust recycles when one plate goes under the other.
5.
oceanic-oceanic convergence
oceanic-continental convergence
continental-continental convergence
6. a. Large ocean trenches form b. large ocean trenches form c. causes large mountains
7. It is when the plates go up or down to each other. earthquakes or trenches. San Andreas fault zone in California.
2.Divergent is when the plates are moving in opposite directions, this happens because magma is pushing up from the mantle and is creating new crust.
3.Mid-Atlantic Ridge, Iceland, Active volcano
4.Convergent is when the crust recycles when one plate goes under the other.
5.
oceanic-oceanic convergenceoceanic-continental convergence continental-continental convergence6. a. Large ocean trenches form b. large ocean trenches form c. causes large mountains
7. It is when the plates go up or down to each other. earthquakes or trenches. San Andreas fault zone in California.
Thursday, October 8, 2009
Geologic timeline questions
1. Multi-cellular life began because the surface of the earth had water on it and the atmosphere began to fill with oxygen. Plus the heavy bombardment ended so life wouldn't be killed by the explosions. With this environment life evolved from single-cellular to multi-cellular.
2. The Archaean Eon because Earth, the oceans, and the moon were formed. Also the heavy bombardment ended to, so the most important events happened during the first eon.
3. Humans are not significant at all compared to the entire history because the Earth is 4.5 billion years old and humans first were around like 20,000 to 40,000 years ago. So the Earth has been human free for around 4,499,980,000 years, so they haven't been around long enough to be significant.
2. The Archaean Eon because Earth, the oceans, and the moon were formed. Also the heavy bombardment ended to, so the most important events happened during the first eon.
3. Humans are not significant at all compared to the entire history because the Earth is 4.5 billion years old and humans first were around like 20,000 to 40,000 years ago. So the Earth has been human free for around 4,499,980,000 years, so they haven't been around long enough to be significant.
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