Continental Drift and Layers of the Earth

Continental Drift and Layers of the Earth

Multiple Choice

According to Wegener's hypothesis of continental drift,

• Earth is shrinking

• The continents do not move, they only appear to drift.

• The Earth once had great land bridges that connected the continents.

• The continents were once joined and have since drifted apart.

Multiple Choice

Which type of evidence was NOT used by Alfred Wegener to support his continental drift hypothesis?

• Similar mountain ranges found on now separated continents.

• Identical fossils found on now separated continents.

• Matching coastlines of South America and Africa

• New oceanic crust being created on the ocean floor.

Multiple Choice

Think about the fossil evidence for contientnal drift.

Fossils of the fern Glossopteris have been found in Africa, Australia, South America, and Antarctica.

How do scientists explain this observation?

• the continents were at one time joined together when the plant was growing and then moved apart

• the fern plants grew independently on each continent

• the wind blew the seeds across the oceans from continent to continent

Multiple Choice

Why did other scientists NOT believe Wegener’s theory?

• He could not explain how the continents moved

• His evidence was wrong

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

Multiple Choice

What is an underwater mountain range where new ocean floor is made called?

• subduction zone

• mid-ocean ridge

• deep-sea trench

Multiple Choice

Where does magma from the mantle rise up during the process of sea-floor spreading?

• Along the mid-ocean ridge

• At the north and south poles

• Along the edges of all the continents near the shoreline and beaches

• at the equator

Multiple Choice

What is causing the seafloor to spread?

• Convection in Earth's mantle

• The Coriolis effect

• Greenhouse gases in Earth's atmosphere

Multiple Choice

Which layer do we live on?

• crust

• mantle

• core

Multiple Select

What are the two types of crust?

• mantle

• core

• oceanic

• continental

Multiple Select

Choose all that apply!

Which of the statements are true about continental crust?

• it is thick

• it is thinner

• it made of older rock

• it is made of younger rock

• it is dense

Multiple Select

Choose all that apply!

Which of the statements are true about oceanic crust?

• it is thick

• it is thinner

• it made of older rock

• it is made of younger rock

• it is dense

Multiple Choice

What is another name for the Earth's lithosphere?

• Continental Crust

• Oceanic Crust

• Tectonic Plates

• Mid Ocean Ridges

Multiple Select

Choose all that apply.

What is the lithosphere made of?

• crust

• upper mantle

• lower mantle

• outer core

• inner core

Multiple Choice

Where does convection happen?

• crust

• mantle

• core

Multiple Choice

Look closely at the diagram.

Which layer is #1? Hint: it is the layer we live on.

• crust

• lithosphere

• mantle

• outer core

• inner core

Multiple Choice

Look closely at the diagram.

Which layer is #2? Hint: tectonic plates

• crust

• lithosphere

• mantle

• outer core

• inner core

Multiple Choice

Look closely at the diagram.

Which layer is #3? Hint: convection happens here

• crust

• lithosphere

• mantle

• outer core

• inner core