Focus On Earth Science: California Grade 6

Lesson 3: Theory of Plate Tectonics

Standards Check

1.
Earth's outer layers are broken into pieces called _______. 1.c
A)plate tectonics
B)lithospheric plates
C)slabs
D)mid-ocean ridges
2.
Convection currents in Earth's mantle _______. 4.c
A)are caused by plate movement
B)transfer heat from Earth's surface to its interior
C)cause radioactive decay to occur in the mantle
D)transfer heat from Earth's interior to its surface
3.
Measurements using the Global Positioning system and satellite laser ranging methods show that plates move at speeds of ______. 1.c
A)centimeters per day
B)meters per year
C)centimeters per year
D)meters per day
4.
A lithospheric plate that sinks into the mantle must be _______. 1.c
A)denser than the mantle
B)less dense than the mantle
C)thicker than the mantle
D)heavier than the mantle
5.
As the temperature of a region of the mantle increases, it _______. 1.b
A)sinks
B)becomes more dense
C)becomes less dense
D)becomes more radioactive
6.
Which is caused by a dense plate sinking into the mantle? 1.c
A)seafloor spreading
B)convection
C)slab pull
D)ridge push
Grade 6
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