Plate tectonics quiz

​ (a)   : an arch-shaped fold which bends downward and contains the youngest rock layers in the center of the fold.

• syncline
• continental drift
• divergent boundary

​ (a)   : the movement of a fluid, such as magma, due to differences in density that are caused by temperature variations.

• convection
• pangea
• athenosphere

​ (a)   : the solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly, which allows tectonic plates to move on top of it.

• asthenosphere
• mid-ocean ridge
• syncline

​ (a)   : the boundary between tectonic plates that are colliding

• convergent
• lithosphere
• convection

​ (a)   : the name of the supercontinent that formed 300 million years ago and that began to break up beginning 250 million years ago

• Pangaea
• transform
• convection

​ (a)   : the boundary between tectonic plates that are sliding past each other horizontally

• transform
• seafloor spreading
• subduction

​ (a)   : the solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle

• lithosphere
• anticline
• plate tectonics

​ (a)   : the boundary between tectonic plates that are moving away from each other.

• divergent
• continental drift
• mid-ocean ridge

​ (a)   : the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations.

• continental drift
• hot spot
• divergent

​ (a)   : a long, undersea mountain chain that has a steep, narrow valley at its center, that forms as magma rises from the mantle.

• mid-ocean ridge
• anticline
• subduction zone