Seafloor Spreading Concepts

The video tutorial, presented by Teresa Reyes, covers the concept of seafloor spreading, a geologic process occurring at divergent plate boundaries. It explains how tectonic plates separate, allowing magma to rise and form new oceanic crust. The tutorial discusses evidence supporting this process, including mid-ocean ridges, deep-sea trenches, geomagnetic reversals, and the age of the seafloor. The video concludes with the implications of seafloor spreading, such as the creation of new geographic features like the Red Sea.

What is the main focus of today's lesson?

• The effects of volcanic eruptions

• The impact of earthquakes

• The process of seafloor spreading

• The formation of mountains

Who first proposed the seafloor spreading hypothesis?

• Harry Hess

• Alfred Wegener

• Isaac Newton

• Charles Darwin

What is created at mid-ocean ridges?

• New ocean floor

• Volcanic islands

• Deep sea trenches

• Continental shelves

Which mid-ocean ridge is known as the longest mountain chain on Earth?

• East Pacific Rise

• Mid-Atlantic Ridge

• Himalayan Ridge

• Andes Ridge

What is the significance of geomagnetic reversals in seafloor spreading?

• They lead to volcanic eruptions

• They provide evidence for seafloor spreading

• They cause earthquakes

• They create new oceanic crust

What do deep sea trenches indicate about tectonic plates?

• They are rotating

• They are stationary

• They are converging

• They are moving apart

How does the age of the seafloor support the concept of seafloor spreading?

• Age of seafloor is irrelevant

• Older seafloor is found near mid-ocean ridges

• Younger seafloor is found near continents

• Older seafloor is found near continents

What future geographic change is predicted due to seafloor spreading?

• The formation of a new ocean

• The creation of new mountain ranges

• The merging of continents

• The separation of the Sinai Peninsula

What balances the creation of new crust through seafloor spreading?

• Subduction of old crust

• Volcanic eruptions

• Earthquakes

• Tsunamis

What is the role of subduction in the seafloor spreading process?

• It creates new oceanic crust

• It destroys old oceanic crust

• It forms new continents

• It causes magnetic reversals