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Science Vocab Ch. 6

Plate Tectonics; Lessons 1 - 3

TermDefinition
Pangaea He proposed that all the continents were once part of a supercontinent called ...
Continental Drift Wegener proposed the hypothesis of ..., which suggested that continents are in constant motion on the surface of Earth.
Mid-Ocean Ridge The mountain ranges in the middle of the oceans are called ...
Seafloor Spreading ... is the process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge.
Normal Polarity Today's magnetic field, shown in Figure 8, is described as having ...-a state in which magnetized objects, such as compass needles, will orient themselves to point north.
Magnetic Reversal Sometimes a ... occurs and the magnetic field reverses direction.
Reversed Polarity The opposite of normal polarity is ...-a state in which magnetized objects would reverse direction and orient themselves to point south, as shown in Figure 8.
Plate Tectonics The theory of ... states that Earth's surface is made of rigid slabs of rock, or plates, that move with respect to each other.
Lithosphere The cold and rigid outermost rock layer is called the ...
Divergent Plate Boundary A ... forms where two plates separate.
Transform Plate Boundary A ... forms where two plates slide past each other.
Convergent Plate Boundary ... form where two plates collide.
Subduction The denser plate sinks below the more buoyant plate in a process called ...
Convection You are probably already familiar with the process of ..., the circulation of material caused by differences in temperature and density.
Ridge Push Rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ridge with a force called ...
Slab Pull As a slab sinks, it pulls on the rest of the plate with a force called ...
Created by: stemljos4017