Science

Underwater mountain ranges

What is a Mid-Ocean Ridge

The process by which molten material adds new oceanic crust to the ocean floor

What is sea floor spreading

a system that uses reflected sound waves to detect and locate objects underwater

What is sonar

What is being modeled at slits A and B as you pull the strips down through the base?

Subduction, the old material is moving back to the mantle

Where are the oldest sediments found?

The farthest from the mid ocean ridge

How do magnetic stripes defend the idea of Sea-Floor Spreading?

The magnetic stripes are a symmetrical pattern found on either side of the Mid- Ocean Ridge, that contain the record of the reversal in the Earth's magnetic field.

This model shows what happens at sea floor spreading centers, such as the mid-Atlantic Ridge. List at least 2 good points of this model.

The model shows the new material rising and it shows the magnetic stripes on both sides of the ridge and it shows new material forming

What are you modeling by pushing the strips up through the base?

The moving of new material from the athenoshpere through the crack litmosphere.

Seafloor spreading is continuing today along Mid-Ocean Ridges such as the Mid-Atlantic Ridge. Predict what effect this will have on the size of the ocean basin:

it would increase the amount on land on the ocean floor

divergent boundary

At what type of plate boundary are Mid-Ocean Ridges found

Look at the map showing Mid-Ocean Ridges and Subduction Zones, which ocean has the largest Mid-Ocean Ridge?

Atlantic Ocean

What are Deep-Ocean Trenches?

Deep trenches on the ocean floor or Underwater canyons

What is Subduction?

Geological process where ocean floor sinks back into the Mantle, because it is older, cooler and more dense.

What is the name of the landmass through which the Mid-Ocean Ridge in the Atlantic Ocean passes? Where is it located?

Iceland is located in the Atlantic Ocean east of Greenland it is Europe's western country it is the second largest island in the Atlantic Ocean.

Describe the process of Sea-Floor Spreading.

In sea-floor spreading, the sea floor spreads apart along both sides of a Mid-Ocean Ridge as the new material is added. The older ocean floor moves away from the Ridge, like a conveyor belts, carrying the continents along with them.

What are at least 2 reasons why this model is not a good model?

It dose to show convection currents working to cause this, and it also it's not always show accurate information with the scale.

Where are the youngest sediments found, compared to the Mid-Atlantic Ridge?

It is youngest at the opening of the ridge.

What are the 3 types of evidence that scientists use to defend the idea of Sea-Floor Spreading?

Molten material - rock Magnetic Stripes Drilling Samples - rock samples

Look at the map showing Mid-Ocean Ridges and Subduction Zones, which ocean has the largest Subduction Zone?

Pacific ocean

How do drilling samples defend the idea of Sea-Floor Spreading?

Rock samples showed younger rocks were found at the center of the Mid- Ocean Ridge. The further away they got from the Ridge, the older the rocks were.

How does molten material defend the idea of Sea-Floor Spreading?

Rock shaped like pillows or toothpaste, form when molten material hardens quickly after erupting. These rock show eruptions occur again and again.

Harry Hess and Robert Dietz

Scientists who developed theory of seafloor spreading in 1960s

What is the Theory of Plate Tectonics?

The Earth's Lithosphere is in slow, constant motion, due to the force of convection currents in the Asthenosphere.

What is a tectonic plate?

The Lithosphere, consisting of the Crust and upper part of the Mantle, is divided into a patchwork of large tectonic plates.

Why do you think geologists might find Iceland a useful place to conduct research on seafloor spreading?

The area is above sea level so geologists do not need the same equipment submarines to study the proses you can see the process first hand

How do the land structures of Iceland help confirm seafloor spreading?

When you move away from the mid ocean ridge the age of the land gets older.

At the mid ocean ridge

Where does Sea-Floor Spreading begin on the ocean floor?

Does the data support the theory of sea floor spreading? How?

Yes because it shows how the sea floor is spreading when new material it added the bigger the ridge gets. This means the material is moving away from the ridge