Unit 4 Plate Tectonics

The place where two plates come together is known as a _______

• transform boundary 
• convergent boundary
• rift valley
• divergent boundary

A collision between two pieces of continental crust at a converging boundary produces a _______

• mid-ocean ridge
• mountain range
• deep ocean trench
• rift va

 Scientists think that convection currents flow in Earth’s _______

• lithosphere
• mantle
• inner core
• continents

Earth’s magnetic field results from movements in the _______

• mantle
• lithosphere
• outer core
• inner core

Using data from seismic waves, geologists have learned that Earth’s interior is made up of several _______

• continents
• oceans
• layers
• mountains

A rift valley forms at a _______

• divergent boundary
• convergent boundary
• subduction
• tran

The geological theory of _______ states that pieces of Earth’s lithosphere are in constant, slow motion.

• plate tectonics
• subduction
• deep-ocean trench
• sea-floor spreading

Most geologists think that the movement of Earth’s plates is caused by _______

• conduction
• radiation
• convection currents
• magnetic field

. The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle is known as _______

• continental drift
• convections
• conduction
• subduction

In sea-floor spreading, molten material rises from the mantle and erupts  _______

• along the edge of continents
• in mid-ocean ridges
• at north pole
• in deep ocean trenches