science chapter 7 lesson 3

materials move based on differences in their temperatures and densities in the process of -----

convection

when two plates collide a -------- forms

convergent plate boundary

convection currents form in the mantle when thermal energy transfers form the----- to the mantle

core

when two plates move away from each other, a ----------- forms

divergent plate boundary

earth's mantle moves because warmer, less dense materials rise and cooler, denser materials ----

sink

when a plate sinks below another plate, it pulls on the rest of the plate, exerting a force called -------

slab pull

earthquakes can also result when plates ----- past each other

slide

the theory plate tectonics explains why earthquakes and-------- occur in certain locations

volcanoes

when one plate dives under another plate, earthquakes can result and ------- can form

volcanoes

scientists now use ------- to measure how continents move.

satellites

when plates ----- on the seafloor, mid ocean ridges form

separate

below the lithosphere is the ------ which is so hot that is flows like ------

asthenosphere plastic

convection currents in the mantle produce a force that cause motion called-------

basal drag

plate tectonics is the unifying theory of ------

geology

when two oceanic plates collide, a trench and an ------- form

island ark

the cold, rigid rock layer on the outermost part of the earth is called the ----. it consists of crust and the upper part of the -----

lithosphere mantle

in the ocean, --------- are located at divergent plate boundaries

mid ocean ridges

when two continental plates collide, neither plates is subducted, ----- form

mountains

of all earth's tectonic plates, the ----------- is the largest plate.

pacific plate

------- of the lithosphere move because they rest on the flowing asthenosphere

parts

the place where two plates meet is called a --------- forms

plate boundary

the theory of ------ states that earth's surface is dicided into large plates of rock. Each plate moves over earth's ----- and changes position with respect to other plates

plate tectonics mantle

inside earth-------- elements provide some of the thermal energy that causes convection

radioactive

plate tectonics theory is still being------- as scientists learn more about how earth's tectonic plates move

revised

plates are pushed away from each other at mid ocean ridges by the force of ------

ridge push

if divergent plate boundaries separate parts of a continent, -------- forms

rift valleys

when plates collide, the plate that is denser slides under the less-dense plate in the process of -----

subduction

------ forces interact to cause tectonic plate motion

three

when two plates slide by each other a ------- forms. this type of movement causes ---------

transform plate boundary earthquakes

when an oceanic plate slide under a continental plate, a deep ocean----- forms. near the trench, a line of ------ forms

trench volcanoes