Plates / Boundaries
What is the convergent boundaries?
Where plates come together or collide
What did rifting cause?
Sea-floor spreading
What are the 2 types of plates?
Ocean plates and continental plates
Where does subduction occur?
occurs near the edges of oceanic plates in regions
What is the divergent boundaries?
when plates move away from each other
What causes convection currents?
hot magma in the earth moves toward the surface, cools, then sinks again
Which convergent boundary type forms a trench?
Type 2
What is a trench?
as a plate sinks through a subduction zone, it bends, forming a depression in the ocean floor
What is the transform boundary?
when plates slide past eachh other, moving in opposite directions
What causes mountains to form?
along plate boundaries
Which boundary has 3 types?
Convergent boundaries
What is continental drift?
the continents move slowly across earth’s surface in a process
What is the plate tectonics?
the earth’s crust & upper mantle broken into sections called Plates
What causes a trench?
In which boundary does earthquakes along faults form?
Transform fault boundaries
Who hypothesized that the continents were once in a single supercontinent, which then broke into pieces that moved apart?
wegener
Whats the difference between ocean and continental plates?
Ocean plates is plates below the ocean while continental plates is plates below the continents
What causes plate tectonics?
convection currents
which type of convergent boundary let volcanoes occur at subduction zones?
Type 1
What is Mid-ocean ridge? And what did they find?
when scientists mapped the ocean floor during the mid-1900s, they found a chain of underwater mountains