Mod. F Unit 1 Assessment Review

Which processes are best explained by the theory of plate tectonics?

• life cycles of plants

• food chains and webs

• changes in air pressure

• earthquakes and volcanic eruptions

Alfred Wegener proposed that the continents were once joined together. Which pair of continents looked like they fit best?

• Asia and India

• South America and Australia

• South America and Africa

• Australia and India

Which description is evidence for the theory of plate tectonics but does not suggest that the continents were once connected?

• matching rock layers on separate continents

• similar land features on separated, present-day continents

• the interlocking of present-day coastlines, such as Africa and South America

• thin layer of sediment covering the ocean floor, indicating that it was relatively young

Which statement supports the claim that the landmasses were connected 225 million years ago?

• Cynognathus and Lystrosaurus were land reptiles unable to swim across the ocean.

• Fossils of the fern Glossopteris seeds were too heavy to be carried across the ocean by wind.

• Mesosaurus was a freshwater crocodile-like reptile so it could have easily swum across the ocean between South America and Africa.

The letters in the map represent sectors of the ocean floor. The sea floor is spreading at a rate of 3-5 cm per year at the Mid-Atlantic Ridge. In which sectors is the youngest rock located?

• Sectors A and D

• Sectors A and B

• Sectors B and C

• Sectors C and D

Which of these does not provide evidence that the continents drifted to their present locations?

• Current weather

• Landform Data

• Deep-ocean trenches

• Similar fossils on multiple continents

What type of plate boundary is shown in the picture?

• convergent

• transform

• divergent

• sea floor spreading

What is happening to the crust?

• crust is moving apart

• crust is sliding past one another

• crust is dividing

• crust is colliding, causing the oceanic crust to subduct

What type of landform is created due to this type of plate boundary?

• mid ocean ridge

• island volcanic arch

• continental volcanic arc

• folded mountains

What term describes the process of a denser oceanic plate going underneath a less dense continental plate and returning to the mantle?

• Convection
• Subduction
• Accretion