Plate Tectonics / Layers of the Earth Review

The San Andreas fault is located where the Pacific plate and North American plate meet, and is also a transform boundary. If it were a CONVERGENT boundary, what would form on the continent?

• a river
• a rift valley
• a chain of islands
• a volcanic mountain

What type of boundary is formed when plates slide past each other?

• horizontal
• transform
• convergent
• divergent

There is a difference in density between oceanic crust and continental crust. This is most likely related to differences in:

• porosity
• composition
• thickness
• the rate it cooled

Which of these did NOT provide evidence for continental drift?

• magnetic reversals
• sea-floor spreading
• oceanic plate theory
• the fossil record

Which process explains how new oceanic lithosphere (oceanic crust) is formed?

• sea-floor spreading
• normal polarity
• reverse polarity
• continental drift

A collision between two pieces of continental crust at a convergent boundary produces a

• mid-ocean ridge
• deep-ocean trench
• rift valley
• mountain range

How did fossil evidence support Wegener’s hypothesis of continental drift?

• Similar fossils found on far apart landmasses suggest that the continents were once a single landmass.
• Fossil evidence suggests that the continents have always been in their current positions.
• No similarities exist between fossils on different continents.
  
• Plant and animal fossils show evidence of changes in Earth’s polarity.

Using the table, which of the following statements is true?

• Oceanic crust is Earth’s thinnest and least dense compositional layer.
• Continental crust is Earth’s thinnest and densest compositional layer.
• The mantle is Earth’s thickest and densest compositional layer.
• The core is Earth’s thickest and densest compositional layer.

What layer is more dense than the crust but less dense than the core?

• Continental crust
• Oceanic crust
• Mantle
• Core

The Himalaya Mountains are currently growing taller. Which statement supports this?

• The Himalayas are still growing because they are at a divergent boundary that is still active.
• The Himalayas are still growing because they are at a convergent boundary that is still active.
• The Himalayas are still growing because they are at a transform boundary that is still active.
• The Himalayas are still growing due the processes of weathering & erosion.