Chapter 14 Plate Tectonics

____ is the force taking place in the area marked by the letter S

The _____ states that Earth's surface is made of rigid slabs of rock, or plates that move

The feature marked by the letter X is a(n) _____

A supercontinent is called

The theory of ______ explains how new crust is created at mid-ocean ridges

The features marked by the letter Y are ___

The Himalayan mountain range of India was formed at a _____

Plates of the lithosphere float on the ____

____ is the process occurring in the area marked by the letter R

Earth's plastic like layer is the ____

_____ are formed when two continental plates collide

Crust is neither destroyed or formed along which boundary

The crust and upper mantle make up the ___

Plates slide past one another at _____

_____ currents inside Earth might drive plate motion

______ is a fossil fern that helped support Wegner's hypothesis of continental drift

Matching _______ on different continents are evidence for continental drift

The main points of evidence for _____ are fossils, rocks, and climate.

A(n) ____ is an underwater mountain chain

One plate is forced under another is a(n)

A change in Earth's magnetic field is called

They hypothesis that continents have slowly moved to their current location is called

The ____ beneath the continents and the seafloor are made of molten rock.

Many early mapmakers thought Earth's continents had moved based on _______

Scientists have observed that the continents move at speeds of a few cm per _____

Plates collide together at a(n)

Active volcanoes are most likely to form at ____

Places where plates move apart are

____ are places where plates slide horizontally past each other

____ occurs when tectonic plates of different density collide

The boundary between two plates moving together is called a

The crust and upper mantle make up Earth's ____

Alfred Wegener believed that the _____ were once joined

Wegener believed that the continents were assembled as a supercontinent about __ years ago

The theory of _____ states that Earth's surface is divided into rigid plates that move

Continental-continental plate collisions produce _____

The youngest part of the ocean floor is found ____

_____ occurs when one tectonic plate descends beneath another

The arrows in the mantle & oceanic crust indicate the direction of flow of _ beneath the plates

The alignment of iron minerals in rocks when they are formed shows Earth's _____ has reversed