Test Over Plate Tectonics Flashcards
Where do convection currents flow?
In the mantle
What is the place where two plates come together, or converge?
Convergent boundary
What is the place where two plates move apart?
Divergent boundary
What is the place where two plates slide past each other in opposite directions?
Transform boundary
What is the part of the mantle near earths crust that is soft?
Asthenosphere
What are the three things that make up the mantle?
Lithosphere
Asthenosphere
Lower Mantle
What are the 3 ways heat is transferred?
Convection
Conduction
Radiation
Three scientists we’ve studied?
Alfred Wegener, Harry Hess and J. Tuzo Wilson
What was Alfred Wegener’s theory?
Theory of continental drift
Continental drift- At one time all the continents were once joined together in a single landmass, he named Pangea, and have since drifted apart.
What was Harry Hess theory? And explain his idea
Theory of Sea-floor Spreading
Sea- floor Spreading- sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. Ocean floors move like a conveyor belt, carrying continents along with them.
What was J. Tuzo Wilsons theory?
Theory of plate tectonics. He proposed that the lithosphere is broken up into separate sections called plates.
What does the theory of plate tectonics explain?
The formation, movement and subduction of Earth’s poles
What is Indirect evidence of Earth’s interior?
Seismic waves produced by earthquakes allow scientist to measure the speed in which they travel giving clues to the structure of the planet.
What is Direct evidence about Earth’s Interior?
Rock samples which are rocks drilled form deep inside earth that allow geologists to make inferences about conditions.
Oceanic crust consists mostly of…?
Basalt
