Development of a Theory-Lesson 2

What device did scientists use in the 1940s to measure ocean floor depths?

• Seismograph

• Echo sounder

• Barometer

• Thermometer

What does an isochron map of the ocean floor show?

• Ocean currents

• Water temperature

• Points of equal depth

• Points that formed at the same time

Tags

NGSS.MS-ESS1-4

Which statement about mid-ocean ridges is correct?

• They are found only in shallow water

• They are shorter than mountain ranges on land

• They contain the youngest oceanic crust

• They are where continents collide

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

What happens to magma when it reaches Earth's surface?

• It becomes lava

• It turns into granite

• It immediately solidifies

• It sinks back down

How does the age of oceanic crust change as you move away from a mid-ocean ridge?

• It becomes younger

• It becomes older

• It stays the same age

• Age varies randomly

Tags

NGSS.HS-ESS1-5

The asthenosphere is:

• A completely liquid layer

• Part of Earth's core

• A solid layer that behaves like plastic due to heat

• The uppermost part of the crust

How fast do tectonic plates typically move?

• 1-9 centimeters per year

• 1-9 meters per year

• 1-9 kilometers per year

• They don't move at all

The lithosphere includes:

• Only the crust

• Only the mantle

• The crust and uppermost mantle

• The entire mantle

Where is the lithosphere thinnest?

• Below continents

• Below ocean trenches

• Below mid-ocean ridges

• Below mountains

The Mariana Trench is significant because:

• It contains the youngest oceanic crust

• It is the deepest landform on Earth

• It is where continents first separated

• It has the most volcanic activity

Tags

NGSS.MS-ESS2-3