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Plates of the lithosphere float on the ____.
core - mantle - crust
asthenosphere
basalt / granitic
continental drift
plate boundaries
Divergent boundary
both
at mid-ocean ridges
Plates move apart at ___________ boundaries.
core - mantle - crust
asthenosphere
basalt / granitic
continental drift
plate boundaries
Divergent boundary
both
at mid-ocean ridges
The youngest rocks on the ocean floor are located _______.
core - mantle - crust
asthenosphere
basalt / granitic
continental drift
plate boundaries
Divergent boundary
both
at mid-ocean ridges
The oceanic crust is composed of dark igneous rocks called __________; whereas the upper continental crust has an average composition of a _________
core - mantle - crust
asthenosphere
basalt / granitic
continental drift
plate boundaries
Divergent boundary
both
at mid-ocean ridges
The result of plate movement can be seen at ____.
core - mantle - crust
asthenosphere
basalt / granitic
continental drift
plate boundaries
Divergent boundary
both
at mid-ocean ridges
The presence of the same _________ on several continents supports the hypothesis of continental drift.
core - mantle - crust
asthenosphere
basalt / granitic
continental drift
plate boundaries
Divergent boundary
both
at mid-ocean ridges
From the center of the Earth outward, what are the layers of Earth?
core - mantle - crust
asthenosphere
basalt / granitic
continental drift
plate boundaries
Divergent boundary
both
at mid-ocean ridges
The hypothesis that continents have slowly moved to their current locations is called _______.
core - mantle - crust
asthenosphere
basalt / granitic
continental drift
plate boundaries
Divergent boundary
both
at mid-ocean ridges
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