Presentation on theme: "Warm Up – Page 78 Answer this on page 78 in your notebook: Mrs. Wilson, I still dont get _________________. Could you explain it again?"— Presentation transcript:
Warm Up – Page 78 Answer this on page 78 in your notebook: Mrs. Wilson, I still dont get _________________. Could you explain it again?
1 P-Waves – move back and forth and through liquids and solids S-Waves – move up and down and side to side and only through solids By studying seismic waves, scientists realized the outer core is liquid
2 Temperature, pressure, and density all increase
10 All the continents were once part of a supercontinent. The continents separated and drifted to their present locations over time.
11 He could not explain the mechanism that could move the continents
12 Geologic – fit of South America and Africa Fossil – various fossils found in places where the animals could not have traveled by water Climate – tropical climate fossils found in cold areas; glacier deposits in Africa
13 Mountains formed at oceanic-oceanic divergent plate boundaries
14 As plates diverge, the sea floor spreads – or becomes larger; on the other side of the world, plates subduct so that the earth does not get larger
15 Older rocks were farther from the ridge and younger rocks were near the ridge The magnetic patterns in the rocks from the magnetic field reversals
16 Deep ocean trenches are created at subduction zones as the older piece of plate once again becomes part of the mantle
17 Oceanic crust – more dense – basalt Continental crust – less dense - granite
18 The plate that is more dense will subduct under the less dense plate; trenches, volcanoes, and mountains can form
19 Divergent – two plates move away from each other Convergent – two plates move towards each other Transform –two plates slip past each other