Oceanography chpt. 2

exam 1

Which of the following features is associated with an oceanic-oceanic convergent boundary?

volcanic island arc.

There are rocks on earth that show magnetic north pointing in multiple directions these rocks are the same age what is the most plausible explanation for this?

At the time of formation the rocks were in different positions all orienting toward magnetic north as the continents have moved the rocks have moved with them from their original positions.

Areas of volcanic activity that are not located at plate boundaries and do not change position are called...

Hot spots

from the sandwich the solid layer of the earth that moves and makes up the plates is the...

 Lithosphere

which of the following is the term for plate boundary where the plates are moving away from each other and new crust is being created?

Divergent

areas where crust is being destroyed and recycled are called...

Subduction zones

mountains are created at what specific plate boundary type?

Continental-continental convergent boundary.

The plastic layer below the surface of the earth on which the plates float is called the:

Asthenosphere

what factor determines which plate is subducted at a subduction zone?

Density

the earth Is 4.6 billion years old why is the oldest ocean floor only 180 million years old?

Because the oldest crust is destroyed at subduction zones

The mid ocean Ridge where new crust is created is also called a...

Spreading center 

Observations in the Appalachian Mountains in the United States and the Caledonian mountains in Europe have revealed that there are similar rock types and structures in both mountain ranges from this which of the following can be inferred?

These mountain ranges were once connected during the time of Pangea

Which of the following is the term for the plate boundary type where crust is neither created nor destroyed but the plates are moving laterally past each other?

Transform

New ocean basins are created at divergent boundaries following what 2 initial processes?

Upwarping and rifting