Two plates slide horizontally past each other, and the crust locks until it suddenly slips. What boundary type is this?

At an ocean-floor boundary, plates move away from each other and magma rises to make new crust. What boundary type is this?

An oceanic plate moves toward a continental plate and sinks beneath it because it is denser. What boundary type is this?

A continent is being stretched as two plates move apart, thinning the crust between them. What boundary type is this?

Two continental plates push together, but neither plate is dense enough to subduct easily. What boundary type is this?

Segments of an ocean ridge are offset where plates move side by side along a fracture zone. What boundary type is this?

One oceanic plate dives beneath another oceanic plate as the two plates move toward each other. What boundary type is this?

Mantle convection pulls two pieces of lithosphere apart, allowing hot material to rise between them. What boundary type is this?

Two continental plates collide and crumple the crust between them upward. What landform is most likely to form?

At a subduction zone beside a continent, the oceanic plate bends downward before sinking into the mantle. What landform forms offshore?

Two oceanic plates move apart, and lava cools into new seafloor along the boundary. What landform is built there?

A continental plate begins to split as the crust stretches, drops down, and is cut by faults. What landform develops?

At an ocean-ocean subduction zone, magma rises through the overriding plate and builds a curved chain of volcanic islands. What landform is this?

Where two plates grind sideways past each other on land, what feature is most likely to form?

Oceanic crust subducts beneath a continent, and magma rises through the continental crust above it. What landform can grow along the coast?

Iceland rises above sea level where a hotspot sits on the spreading center in the middle of the Atlantic. What landform is Iceland an exposed part of?

A dense oceanic plate subducts beneath a continent, melts at depth, and feeds magma into the crust above. What hazard is most likely?

A transform fault under a city has locked for decades, then suddenly releases stored stress. What hazard should people expect?

In a continental rift, crust is stretched thin and magma can rise through cracks. What hazard is most likely there?

A major undersea subduction earthquake suddenly lifts part of the seafloor and moves the water above it. What hazard can result?

Two continental plates collide, raising mountains and breaking rocks along faults. Which hazard is common in that setting?

At a mid-ocean ridge, plates spread apart and magma erupts onto the seafloor. What hazard is most closely tied to that boundary?

Around much of the Pacific Ring of Fire, oceanic plates sink beneath other plates. What hazards are especially common there?

The Mid-Atlantic Ridge adds new basaltic crust to both sides as the Atlantic Ocean slowly widens. What boundary does it mark?

California's San Andreas Fault separates plates that slide horizontally past each other. What boundary type is it?

The Himalayas formed as the Indian Plate pushed into the Eurasian Plate, thickening continental crust. What boundary type built them?

The Peru-Chile Trench lies where the Nazca Plate sinks beneath South America. What boundary type is this trench part of?

The East African Rift is where continental crust is being pulled apart and faulted. What boundary type is developing there?

Japan sits along an island arc formed above subducting oceanic plates on the western Pacific edge. What boundary type explains it?

New Zealand's Alpine Fault marks where the Pacific and Australian plates slide past one another. What boundary type is it?