What type of boundary does Seafloor Spreading occur?

One of the longest mountain chains on the planet earth is found between North America and Eurasia. This mountain chain is called the

This feature is where the plates rip apart and magma rises to form new crust.

The material that is rising up from the mantle to form new ocean crust is called?

If new ocean crust is found around the rift valley, where do you find the olest crust?

What is the classification of the rock being formed at a rift valley?

The rocks on the ocean floor show evidence that the magnetism alternates North and South as you move along the sea-floor. This evidence of sea-floor spreading is reflected in the rocks on the ocean floor. The name for this evidence is called?

Youngest oceanic crust is found at the Mid-Ocean Ridge. Age gets progressively older as you get farther from the mid-ocean ridge. Why is the Earth not expanding in size?

The boundary where you would find a rift valley is called ?

The ocean floor was first mapped out using a device called?

Divergent Boundaries are where two plates are moving in the opposite directions. Rising magma is pushing apart and adding new crust. This is also know as ?

Features of a Divergent Boundary are Mid-Ocean ridges, Rift Valley and ?

The ocean floor is made up of what kind of Igneous rock?

At mid-ocean ridges, molten material (magma) rises from the mantle and erupts as fissure volcanoes. The molten material then spreads out, pusing older rock to both sides of the ridges. This process is called?