Theories about the composition of the Earth's core are supported by meteorites that are composed primarily of

• oxygen and silicon
• aluminum and oxygen
• iron and nickel
• aluminum and iron

The solid rock material that directly underlies the sediments on the ocean floor is part of the Earth's

• troposphere
• hydrosphere
• lithosphere
• outer core

According to the rock cycle below which rock forms from the melting and solidification of magma?

• Classic Rock
• Ingenious Rock
• Igneous Rock
• Metamorphic Rock
• Sedimentary Rock

Which processes lead to the formation of Metamorphic Rock?

• Heat and/or pressure
• Erosion, deposition, and cementation
• Burial and compaction of sediment
• Melting and solidification of magma

Which combination of temperature and pressure is inferred to occur within Earth's outer core?

• 5500°C and 0.4 million atmospheres
• 5500°C and 2.0 million atmospheres
• 3500°C and 0.4 million atmospheres
• 3500°C and 2.0 million atmospheres

What is the approximate percentage by volume of oxygen in the crust of the Earth?

• 90%
• 70%
• 30%
• 20%

In which layer of the Earth would the temperature be at 200 degrees Celsius?

• Inner Core
• Outer Core
• Stiffer Mantle
• Asthenosphere
• Lithosphere

In which layer of the Earth would the pressure reach 3.5 million atmospheres?

• Inner Core
• Outer Core
• Stiffer Mantle
• Asthenosphere
• Lithosphere

What is the approximate temperature inside the Earth at a depth of 1500 km?

• 5800 degrees Celsius
• 3800 degrees Celsius
• 300 degrees Celsius
• 0.5 degrees Celsius

The water sphere of the Earth is known as the

• hydrosphere
• lithosphere
• troposphere
• atmosphere