Unit 1.2 Review

How are trenches formed?

• two oceanic plates converging
• two oceanic plates diverging
• two continental plates diverging
• two continental plates converging

Which geological feature is created when oceanic plate is forced under an continental plate?

• divergent boundary
• subduction zone
• mid-ocean ridge
• rift valley

Tectonic motion causes tension between plates causing....

• subsidence
• earthquake
• volcanic eruption
• meteoroid impact

How did seismometers show evidence for the theory of plate tectonics in the 1960's?

• by allowing scientists to prevent future volcanoes near tectonic plate boundarie
• by providing evidence the continents have moved extensively over time
• by providing evidence of interactions between moving tectonic plates
• by allowing scientists to predict where future earthquakes would occur

Which of these is the most recent evidence of plate tectonics?

• volcanic activity and seafloor spreading at the mid-ocean ridges
• similar fossils found on continents that are now separated by oceans
• the observation that the continents of South America and Africa fit together like in a puzzle
• similar rock formations found on different continents that are now separated by oceans

What occurs at a place on Earth where two plates of crust are moving away from each other?

• An eroded mountain will rise
• Magma will form new crust
• A freshwater lake will develop
• Rivers will form  canyon

How is a rift valley formed?

• Two tectonic plates separated from each other
• Two tectonic plates collided with each other
• One tectonic plate slid under another
• One tectonic plate slid past another

Why is Earth tectonically active?

• Earth’s solid surface layer rotates more rapidly than the layers beneath it.
• Areas of Earth’s solid surface layer are under great pressure from ocean water.
• Earth’s solid surface layer sits on a moving, semi-liquid layer.
• Areas of Earth’s solid surface layer are thicker and so heavier than other areas.

What process is represented by this diagram?

• rotation
• conduction
• radiation
• convection

Which area would experience the fewest earhquakes?

• 1
• 2
• 3
• 4