Earth's Layers

Which layer of Earth is made up of liquid iron?

• continental crust
• mantle
• outer core
• inner core

Which layer of Earth is composed of circulating molten rock?

• oceanic crust
• continental crust
• outer core
• mantle

Which crust is composed of mostly granite?

• continental crust
• oceanic crust
• all crust
• none of them

True or false: the inner core is a solid layer made up of mostly iron.

• True
• False
• Not enough information
• Too much information

The lithosphere is made up of which two layers?

• crust and core
• crust and upper mantle
• lower mantle and outer core
• just the continental crust

Which layer is considered the tectonic plates?

• asthenosphere
• outer core
• lithosphere
• mantle

Which layer is the hottest layer?

• oceanic crust
• asthenosphere
• outer core
• inner core

Which scientist developed the idea that continental drift existed?

• Alfred Lothar Wegener
• Harry Hess
• Marie Tharp
• Albert Einstein

Which of the following is not evidence of continental drift?

• similar fossils were found on different continents
• mountain ranges in North America matched with mountain ranges in Africa
• a triceratops bone was found in South Dakota
• the same glacial sediment was found on multiple continents

Which of the following is evidence that the seafloor is spreading?

• The ocean is getting larger every day.
• The age of the rocks at the mid-ocean ridge is younger than the rocks further away.
• The magnetic field is stayed the same over the past 4 million years.
• Sonar technology shows there are many marine organisms in the ocean.