Earth’s Layers Note booklet pgs. 2-4 Plate Tectonics Earth’s Layers Note booklet pgs. 2-4

Density – It’s in the layers Earth’s layers are divided based on density. List the layers of the Earth in order from MOST to LEAST dense. Inner Core Outer Core Mantle Oceanic Crust Continental Crust

Mark out the Mantle

This is one layer - Mesosphere

Questions to ponder: How do you think they figured out the different densities of the layers?

Questions to ponder: Answer – Seismic Waves

What do you think it looks like in between the layers? Questions to ponder: What do you think it looks like in between the layers?

Questions to ponder: Answer – It looks like separation in the same way oil and water separate

Layer % (°C) Elements Other Facts Crust 1% Air temp. - 1,600 ºC Calcium (Ca), Sodium (Na), Aluminum (Al), Sulfur (S) 8-32km thick Oceanic = thin & dense basalt Cont. = thick & less dense granite Mantle 84% 1,000 – 3,700 ºC Iron (Fe), Magnesium (Mg), Calcium (Ca), Aluminum (Al), Oxygen (O), Silicon (Si) 2,890 km thick Outer Core 15% 2,200 – 5,000 ºC Nickle (Ni) & Iron (Fe) Liquid 2,260 thick 5,000 ºC Inner Core Solid 1,220 km thick

Questions to ponder: Why do you think the inner core is solid even though the outer core is a liquid?

Questions to ponder: Answer - Pressure

What layer do you think most directly affects the crust? Questions to ponder: What layer do you think most directly affects the crust?

Questions to ponder: Answer – The mantle, it’s such a large % of the Earth’s volume and it’s directly underneath the crust

Lithosphere The rigid outer part of the earth, consisting of the crust and the upper mantle.

Lithosphere Two types of crust Lithosphere Upper mantle

Asthenosphere What causes Earth’s lithospheric plates to move?

Answer – Convection Currents in the mantle

https://www.youtube.com/watch?v=kwfNGatxUJI

https://www.youtube.com/watch?v=nbU809Cyrao

Plate Tectonics On the next page of your notebook, pg. 4, complete the reading and answer the 2 follow up questions. You have 15 minutes You will be called on to answer the questions

Plate Tectonics List four pieces of evidence to support Wegener’s theory of continental drift

Plate Tectonics 1. Puzzle-like fit of the continents 2. Similar fossils on different continents 3. Remains of tropical plants found in the Arctic areas and glacial deposits in the tropics 4. Similar rock structures found on different continents

Plate Tectonics Why was Wegener’s theory of continental drift rejected by other scientists?

Plate Tectonics Wegener couldn’t explain why or how the continents moved

Questions to ponder: So, what do you think the continent Pangaea that Wegener describes would have looked like?

Classwork Great answers! Let’s look at this puzzle further – turn to pg. 3 in your classwork booklet

Final Thoughts On your own paper answer the following questions Make sure to put your name on the exit ticket to be turned in!

Exit Ticket 1. If all of the continents were once joined as Pangaea, what did the rest of Earth look like? 2. How does the occurrence of the same plant fossils in South America and Africa support continental drift? Explain.