The ridge part of the plates of the _____________ are made of oceanic crust or continental crust and upper mantle.
__________________ _________________, occurring in the mantle, are thought to be the force behind plate tectonics.
The main lines of evidence for _____________ ______________ are fossil, rock, and climate clues, and the theory of seafloor spreading.
The theory of ____________ ____________ was shown to be correct by age evidence and magnetic clues.
The theory that describes Earth's crust and upper mantle as being broken into sections is called __________ _______________.
The places between plates moving together are called_____________ ____________.
The lack of explination for continental drift prevented many scientents from believing a single supercontinent called _____________once existed.
fossils and rocks
The presence of the same ___________ __________ on several continents supports the idea of continental drift.
hot, dense material below Earth's surface is forced upward
Seafloor spreading occurs because ______________________________________________________________.
rift valleys & plate boundries
The results of plate movement can be seen at ________________________.
The cycle of heating, rising, cooling and sinking is called________________ _________________.
samples of rock from different locations
Scientists aboard the Glomar Challenger added to the evidence for the theory of seafloor spreading by providing _____________________.
The ________________ are forming where the Indo-Australian plates collides into the Eurasian plate.
The hypothesis that continents have moved slowly to their current locations is called ______________ ____________.
mountains, volcanoes, ocean basins
As Earth's plates move apart at some boundaries, they collide at others, forming___________,_______________,__________________________.