Continental Drift and Plate Tectonics Lesson

Continental Drift Blind Quizizz

Poll

Ready to learn about the earth today?

• Oh yeah! (ᵔᴥᵔ)

• Sure. =＾● ⋏ ●＾=

• If you say so. (. ❛ ᴗ ❛.)

• Wake me when it's over. (⊙_◎)

Multiple Choice

First, some review...what is the outer layer of the Earth called? (points)

• Outer Core

• Inner Core

• Crust

• Mantle

Multiple Choice

Which best describes the inner core?

• Liquid iron and nickel

• solid iron and nickel

• Liquidified rocks

• The setting for a Jules Verne story.

Multiple Choice

This layer has the consistency of silly putty.

• crust

• outer core

• inner core

• mantle

Poll

Now for some new stuff (no points)... who first theorized that the continents drifted?

• Alfred Einstein

• Alfred Wegener

• Alfred E. Newman

• Alfred, Batman's butler

Alfred Wegener

• Proposed continental drift in 1915

• Theorized a supercontinent, which he called Pangaea, began to break apart over 200 million years ago.

• How it happened...he suggested the continents "plowed" through the crust.

Multiple Choice

According to Wegener, what happened about 200 million years ago?

• The South America and Nazca plates collided.

• The supercontinent began breaking into smaller continents.

• Magma rose to Earth’s surface and solidified.

• The continents drifted to their present locations.

Poll

What evidence supported Wegener's theory?

• Coal deposits in Antarctica

• glacial abrasions in the South African desert.

• Continents fit together like a puzzle

• Matching fossils across oceans

Wegener's Evidence

• The continents fit together like a puzzle.

• Fossils matched across oceans

• Rock types and mountain ranges matched across oceans.

• Coal deposits in Antarctica.

Poll

What discovery during World War II helped explain Wegener's theory? (no points)

• mid-ocean ridges

• sea floor spreading

• magnetic polarity reversals on the ocean floor

Open Ended

Take a look at this map of the world? What do you see?

Evidence Wegener Didn't Have

• American naval officer Harry Hess discovers mid-ocean ridges (undersea mountain ranges).

• Sea Floor Spreading -- rock gets older farther away from the mid-ocean ridge; means new rock is forming at ridge.

• Evidence of magnetic polarity reversals on both sides ?of the ridge (the geomagnetic reversal time scale)

Geomagnetic Reversal Time Scale

• New rock is forming at the mid-ocean ridge.

• Rock farther from the ridge is older.

• The colors on the graphic indicate magnetic polarity reversals on both sides of the ridge

Multiple Choice

Now for review questions. These are worth points.

Scientists used the pattern of alternating polarity in rocks to create the geomagnetic

• time scale.

• sea-floor time scale.

• reversal time scale.

• fish scale

Multiple Choice

How does rock that is closer to a mid-ocean ridge compare to sediment that is farther away?

• It is larger.

• It is smaller.

• It is older.

• It is younger.

Multiple Choice

Wegener’s hypothesis of continental drift was finally confirmed by ... (hint: this was discovered after Wegener's death)

• fossils from the same reptile found on two continents.

• evidence supporting the idea of sea-floor spreading.

• continental coastlines that fit together.

• the formation of mountain ranges such as the Andes.

How the continents move is something we will discuss tomorrow.

Multiple Choice

Which of the following was NOT a piece of evidence Wegener found to support his hypothesis?

• debris from glaciers in southern Africa

• mountains of similar age in North America and Scotland

• tracks of continents plowing through ocean floor rock

• identical Mesosaurus fossils in South America and Africa

Multiple Choice

Why did no one believe Wegener's theory?

• He could not explain HOW the continents moved

• His data was wrong

• He didn't have evidence

• He didn't use the right technology to gather data

Poll

How did you like the blind quizizz on continental drift?

• It was awesome! (｡♥‿♥｡)

• What a great way to learn new material. ᕙ༼*◕_◕*༽ᕤ

• It was fun.

  （っ＾▿＾）

• Wait...this isn't 1st block?

  ಠ_ಠ