continental drift
what is continental drift
the theory that Earth's continents move slowly across the surface over geological time
what is deep-ocean trenches
They are long, narrow, V-shaped depressions in the seafloor
what are plate boundaries
Plate boundaries are the edges where tectonic plates meet, acting as the, largely active, zones responsible for most earthquakes, volcanoes, and mountain building.
what is plate tectonics
Plate tectonics is the scientific theory that Earth's outer layer is divided into several moving plates
who proposed the idea of continental drift
Alfred Wegener
what is mid-ocean ridges
Mid-ocean ridges are long underwater mountain chains found on the ocean floor
what is convergent bounderies
Plates move toward each other and collide, creating mountains, trenches, and volcanoes
what does plate tectonics have to do with continental drift
by providing the mechanism,mantle convection driving seafloor spreading,that Alfred Wegener lacked
when was the idea proposed
1912
what is seafloor spreading
Sea-floor spreading is the process where new oceanic crust forms at mid-ocean ridges
what is transform boundaries
Plates slide past each other horizontally, causing earthquakes and creating fault lines
what does the theory of plate tectonics explain
This theory explains continental drift, sea-floor spreading, earthquakes, volcanoes, and mountain formation
what evidence supports that continental drift happened
the jigsaw-puzzle fit of continents, identical fossil species found on separated continents, matching mountain ranges and rock types across oceans, and paleoclimatic clues like glacial deposits near the equator
where are the mid-ocean ridges found
The ridges are found in the middle of ocean basins and run through all the world's oceans
what is divergergent boundaires
plates move away from each other, creating new crust at mid-ocean ridges
who proposed the idea of plate tectonics
Modern plate tectonics was solidified in the 1960s by Harry Hess’s seafloor spreading and Tuzo Wilson’s transform faults, combining earlier ideas.
how do hot spots provide evidence for continental drift
creating chains of volcanoes that act as a "conveyor belt" record of plate movement
where can deep-ocean trenches be found
around the edges of the Pacific Ocean, often parallel to island arcs or continental margins, with others in the Atlantic and Indian Oceans
how do plate boundaries work together
Plate boundaries work together as a global conveyor system driven by mantle convection, where crust is created at divergent boundaries, recycled at convergent boundaries, and shifted at transform boundaries
why is plate tectonics important
Plate tectonics is fundamental to Earth's habitability and geological activity, driving the carbon cycle to regulate climate, creating continental landmasses, and enabling nutrient cycling.