Boundary Questions

1. The first three boundaries listed are Divergent boundaries, Convergent boundaries and Transform boundaries.

2. Divergent boundaries are new crusts generated as the plates pull away from each other, so divergent means to move pull away. The force that moves the plates apart is magma pushing up from the mantle.

3. A specific mid-ocean ridge is the Mid-Atlantic Ridge. The country that sits directly on top of the ridge is Iceland. The red triangles of the map are volcanoes.

4.Convergent means a very slow collision.

5.
a.Oceanic-continental


b.Oceanic-oceanic

c.Continental-continental

6.
a. What happens to the Earth's surface above the Oceanic-continental subduction zone is that large mountains are created strong and destructive earthquakes occur, rapid uplift of mountain ranges. Also creating volcanic arcs.
b. What happens to the Earth's surface above the Oceanic-oceanic convergence is that it forms volcanoes. Typically these volcanoes are strung out in chains of island arcs. Those island arcs create trenches.
c. What happens when an continental-continental convergence happens, is that high mountains are created.

7. A transform boundary is when two plates are sliding horizontally past one another. They created a large fault or fracture zone that connects two spreading centers (divergent plate boundaries). One example in North America would be the San Andreas fault zone in California.

8.
a.It is a divergent boundary. The plates that are interacting are the Eurasian Plate and the North American Plate in the north being separated. As well as the African Plate and South American Plate in the south being separated.

b.It is a convergence boundary that interacts with the Pacific plate converging with other plates from the west.

c.It is a convergent boundary of the Eurasian plate and the Sunda plate.

d. It is a divergence boundary of the African plate

e.It was a divergent boundary between the Arabia Plate and African Plate.

f.It is a convergent boundary between the Nazca Plate being subducted under the South American Plate

g. It is a convergent boundary between the Pacific and North American plates.

Geologic Timeline

1. What things had to happen were, oceans had to form. Since those oceans were created, cyanobacteria showed up cyanobacteria which created oxygen and slowly filled the atmosphere. Then when the atmosphere was filled with oxygen, multicelluar life was able to live.

2.The Archaeon Eon because that's when the Earth was born. This is also when the Earth finished stratifying and the atmosphere started showing up. Other events during this Eon was, oceans forming and heavy bombardment ending.

3.Human presence was insignificant compared to the History of the Earth because the Earth has been around for 4.5 billion years and life has only been alive for 543 million years.

Fossil Identification

1.Ammonites

I think that the first picture of the Ammonites fossil is a replace remain fossil because originally it was a shell. And shell is made of calcium compounds or bone and in this picture it has been altered into a different substance. The molecules of the bone has been changed into some sort of rock over a period of time.







2. Trilobite

I think that the picture is a Mold and Cast fossil because it looks as if the animal that was fossilized had left an imprint of itself. The fossil must of dissolved out of the rock creating a mold and other types of sedimentary rocks must have filled its place creating a cast.

Relative Dating and Strata

I know that layer 3 is the youngest because of the principle of cross cutting relationships, which means the intrusion is younger than the surrounding layers. Next would be 1 because of the principle of superposition in which it is on top of all the other layers. Then would come 6 because of the same reasons. 2 would be next because it is an intrusion but stops at 6 and 4 is older than 5 because of superposition and 4 is under the layer of 5. So the order is 3,1,6,2,5,4.

Sequence.

1.Bob is born
2.Bob looses his first tooth
3.Bob is tall enough to ride the roller coaster
4.Bob starts middle school
5.Bob gets his driver’s license
6.Bob graduates from high school
7.Bob joins the Marines

8.Bob gets married.

There could be some changes, because it depends on what time he lost his tooth or got tall enough for the roller coaster or he could of gotten his license any other time. Because, loosing teeth and growing can happen at different times. He was born 1991.