Pangea, Seafloor Spreading

Sea-floor Spreading is the theory that new sea floor is added at ________________

• Mid-ocean trenches

• Deep ocean trenches

• Continents

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS2-2

What are Mid-Ocean Ridges?

• A chain of underwater waterfalls

• A chain of underwater volcanos

• A deep canyon in the ocean floor

Tags

NGSS.MS-ESS2-3

The OLDEST seafloor is located? 

• Closest to the mid-ocean ridge
• Farthest from the mid-ocean ridge

Tags

NGSS.MS-ESS1-4

True or false : Deep-Ocean Trenches are underwater canyons?

• False
• True

What is one piece of evidence of seafloor spreading?

• scientist found animals at the bottom of the sea

• expanding continents

• scientist found pillow shaped rocks (made from lava)

Tags

NGSS.MS-ESS2-3

Another piece of evidence for sea-floor spreading is the age of rocks. Choose the true statement about this evidence below:

• The age of the oceanic crust gets older the further you go from a mid-ocean ridge.

• The age of the oceanic crust gets younger the further you go from a mid-ocean ridge.

• The age of the oceanic crust is the exactly the same no matter where you go.

Tags

NGSS.MS-ESS1-4

Magnetic stripes in the oceanic crust are another piece of evidence that prove the ocean floor....

• Was made at the same time

• Has different ages throughout the floor (newer crust next to MOR)

• Changes the magnetic poles of the earth

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS2-2

The oceanic crust is pushed aside on both sides of the 

• Continent's edge
• Deep-ocean trench
• Mid-ocean ridge

Tags

NGSS.MS-ESS2-3

The oceanic crust _________ when it reaches the continental crust.

• subducts (sinks)

• rises

• expands

Tags

NGSS.MS-ESS2-3

New crust is always formed at the...

• mid-ocean ridge
• deep-ocean trench
• asthenosphere