Stuff
Continental drift states that continents have moved ___ to their current location.
Slowly
List two things that supported Wegengers hypothesis of continental drift.
The presents of rocks and fossils.
The East- African Rift is an example of what?
A continental rift
Define asthenosphere.
Earths plastic like structure.
Define Pangea.
The super continent that once existed
In order to complete a convection current, the rising material must eventually _____ Earth.
Sinks back into
What is formed when two continental plates collide?
What are Mountain Ranges?
Define continental drift.
hypothesis that continents have slowly moved to their current locations.
Define mantle.
beneath the continents and the seafloor is made of molten rock.
Define lithosphere.
Earths upper crust and mantle
What happens at oceanic-oceanic convergent plate boundaries?
old crust is recycled by subduction
Why was continental drift not widely accepted by Wegener's peers?
Wegener could not explain why or how the continents moved.
Where is the youngest part of the ocean floor formed?
Near ocean ridges
Define convergent plate boundaries.
Where plates come together.
Define plate tectonics.
Earth’s surface is made of rigid slabs of rock
Plates of the lithosphere float on the ____.
asthenospher
Define Transform Plate boundaries
Plates slide past one another
The alignment of iron minerals in rocks when they are formed reflects the fact that Earth’s _______ has reversed.
Magnetic field
Define divergent plate boundaries.
Where plates separate
The driving forces of tectonic plates are related to the convection currents in Earth’s ________.
Mantle
The downward part of a convection current causes a sinking force that does what to tectonic plates?
pulls plates toward one another
Define divergent plate boundaries
When plates separate
Define subduction zone.
One plate formed under another
Define seafloor spreading.
Explains how the crust made the Mid Ocean Ridge
Define magnetometer
A sensitive device used to detect magnetic fields on the seafloor.