Wegeners Evidence/Pangaea
What is Wegener's theory of continental drift?
That all the continents were once together and have drifted apart.
What is a hot spot?
Large plume of hot mantle material rising from deep within the Earth
What happens to the plates at divergent plate boundary? What event do we get?
The plates slide apart from one another and you get a volcano.
What are the three types of rock we learned about in class?
Metamorphic rock, igneous rock, and sedimentary rock
What is the outermost layer of the Earth?
Crust
Pangaea.
What do hot spots form?
Volcanoes
What happens to the plates at a transform plate boundary? What event do we get?
The plates slide along one another and we get an earthquake.
What do the edges of our plates look like?
Rigid, not smooth
What is the middle/thickest layer of the Earth?
Mantle.
What are glacial striations and what do they do to prove Wegener's Theory?
Glacial striations are grooves in the rocks left from glaciers. The glacial striations match up from continent to continent.
How do volcanoes form? (Hint; there are two ways)
Divergent plate boundaries and hot spots
What happens to the plates at convergent: collisional plate boundary? What event do we get?
The slides collide and get pushed up to form a mountain.
Which is more dense; oceanic plate or a continental plate?
Oceanic plate
What is the deepest layer in the Earth?
Core
Animals that could not swim far, had fossils on continents that were far apart. Meaning that they had to be close enough for the animal to swim close or walk across.
In what Earth layer does the convection current occur?
Mantle
What happens to the plates at convergent: subduction plate boundary? What event do we get?
True or false: All tectonic plates are moving in the same direction.
False. They are all moving, but in different directions.
From our edible Earth lab, what did each layer of the Earth get represented by?
Inner core - M&M
Outer core - Marshmellow
Mantle - Rice Krispie
Crust - Chocolate
Provide reasoning for the following:
Claim - The continents were all once close or connected.
Evidence - The same rocks and rock sequence was found on South America and Africa.
The rock sequence, from oldest to youngest (basalt, limestone, coal, and shale), matches perfectly on two continents that are not touching.
What does it mean that the Earth is recycling?
There is a recycling of Earth's rock, air, and ocean (elements) through the tectonic plate system (convection cycle).
If there are mountains and volcanic eruptions happening in the same place, which plate boundary most likely is happening there?
Convergent plate boundary (collisional and subduction).
What are the four types of rock found on the edge of South America and Africa?
Shale, coal, limestone, and basalt
What is the difference between the inner core and the outer core?
The inner core is a spinning solid, the outer core is a liquid.