Wednesday, September 22, 2010

fossils




This fossil is the original remains. It is unchanged remains. In rare cases animals are preserved in its entirety.















This fossil is a trace fossil. This fossil is an impression left in the rock left by an animal.

Friday, September 17, 2010

science

First, create a new post on your blog. Second, paste the picture above into it. Then, use what you know about the principles of superposition and cross-cutting relationships to decide the order in which the different rock formations were formed. Order them from youngest to oldest. Then, explain why you put them where you did! Notice how that previous sentence was all in italics? That's because you have to explain your logic. Do not skip this 

this is the order  3, 2, 1 ,6 , 4, 5 from youngest to oldest.   3 would be the youngest because it cut through 2 layers of rock and its an intrusion so the principle of cross makes it young. 2 is also an intrusion but it only goes through 1 layer of rock but principle of cross makes it one of the youngest. 1 is the top layer so the principle of superposition makes it one of the younger ones. 6 is on the second layer of rock not including the intrusions so the principle of superposition makes it the 4th oldest. number 4 is the second to last rock closest to the bottom so the principle of superposition makes it one of the oldest rock layers.  The oldest layer is 5 because it is at the very bottom so principle of superposition makes it the oldest.