Divergent Boundary
In what direction do the plates move?
They divide, depart, or move away from each other.
In what direction do the plates move?
They collide, converge, or move towards each other.
In what direction do the plates move?
They slide past each other in opposite directions
What is continental drift theory?
the idea that Earth's continents were once joined together in a single supercontinent, and that they have since moved apart to their current positions.
Who Created Continental Drift Theory?
The theory of continental drift was developed in the early 20th century by Alfred Wegener
What type of landforms do they create?
Rift valleys and Ocean ridges
What type of landforms do they create?
Mountains, Volcanic Island Arcs., and Volcanoes.
What type of landforms/processes do they create?
Earthquakes
What was the supercontinent called?
Pangea
What is the Law of Superposition?
In a sequence of layered rock beds, the oldest layer is at the bottom and the youngest layer is at the top. This principle is based on the idea that younger layers of sedimentary rock are deposited on top of older layers.
What is a real life example of this boundary?
The Great African Rift Valley or the Mid Atlantic Ridge.
What is a real life example of this boundary?
Himalayan Mountains or the Andes Mountains.
What is a real life example of this boundary?
The San Andres Fault
What are the three pieces of evidence that helps support continental drift theory? Explain.
Landforms, Climate, and Fossils.
What is a fossil record?
The fossil record is a collection of fossils documenting the history of life on Earth.
What is Sea Floor Spreading?
Seafloor Spreading is the usual process at work at divergent plate boundaries, leading to the creation of new ocean floor. As two tectonic plates slowly separate, molten material rises up from within the mantle to fill the opening.
What is subduction?
A geologic process in which one edge of one lithospheric plate is forced below the edge of another. The denser of the two plates sinks beneath the other.
What causes the Earthquakes?
The stress built up from the plates getting stuck while moving past each other. Once they break apart the release of that pressure creates the earthquake.
What is the driving force that makes the plate drift.
Convection current in the mantle
How can fossil records tell a story of the land before?
They show us how the Earth and our environment have changed through geological time, and how continents, now widely separated, were once connected. Different types of fossils in the same area, but in different layers can show us how the ecosystem has changed over time.
Do divergent boundaries have volcanic activity?
Yes
Do Convergent Boundaries have volcanic activity?
Yes
Do transform Boundaries have volcanic activity?
No
What property of oceans supports Wegener’s theory of continental drift?
A pattern of magnetism along the sides of mid-ocean ridges. Changes in magnetic poles cause changes in tidal patterns along Earth’s coastlines.
Why is the Law of Superposition useful?
It useful for relative dating of ancient organisms