17 terms

Earth's Structure - Part II

Continental Drift
Alfred Wegener's hypothesis that the continents where once joined in a single landmass
the super continent that existed millions of years ago
plate tectonics
the theory that states that pieces of Earth's lithosphere are in constant slow motion
igneous rock
rock formed when magma and lava cools
molten rock material before it reaches Earth's surface
when energy builds up in the rock along a fault causing the rock to slip or break
an opening in the Earth's surface through which molten material flows
a break in the Earth's crust where rocks have slipped past each other
molten rock that reaches Earth's surface
convergent boundary
two tectonic plates move towards each other
transform boundary
two tectonic plates slip past each other in opposite directions
divergent boundary
two tectonic plates move away from each other
seismic waves
starts at the FOCUS beneath Earth's surface where stress builds up and breaks rock
extinct volcano
a volcano that is unlikely to ever erupt again
dormant volcano
a volcano that isn't currently active that scientist expect to awaken in the future
active volcano
a volcano that is erupting or has shown signs of erupting in the near future
constructive forces
both volcanoes and earthquakes are constructive forces that build up new land