Key Idea.
Section 1
Decoding Geologic Clues
Scientists act as detectives to identify plate boundaries. They cannot always see the plates moving, so they look for geologic indicators. The direction of movement defines the boundary type.
If the evidence shows new rock forming and plates separating, it is a divergent boundary. If the evidence shows subduction, trenches, or plates colliding, it is a convergent boundary.
Section 2
Synthesis of Boundary Types
Different boundaries result in different outcomes for the Earth's crust. Divergent boundaries result in construction (new rock added), while convergent boundaries often result in destruction (rock recycled).
By mapping these processes globally, scientists understand the cycle of Earth's surface. The rigid plates are constantly being built at one edge and destroyed at another, driven by the dynamic mantle below.
Expand to review the lesson summary and core properties.
Section 1
Decoding Geologic Clues
Scientists act as detectives to identify plate boundaries. They cannot always see the plates moving, so they look for geologic indicators. The direction of movement defines the boundary type.
If the evidence shows new rock forming and plates separating, it is a divergent boundary. If the evidence shows subduction, trenches, or plates colliding, it is a convergent boundary.
Section 2
Synthesis of Boundary Types
Different boundaries result in different outcomes for the Earth's crust. Divergent boundaries result in construction (new rock added), while convergent boundaries often result in destruction (rock recycled).
By mapping these processes globally, scientists understand the cycle of Earth's surface. The rigid plates are constantly being built at one edge and destroyed at another, driven by the dynamic mantle below.