Which of the following is a major component of Earth's core, along with iron and nickel?

Which layer of the Earth's atmosphere is characterized by decreasing temperature with altitude and contains the ozone layer?

Which of the following is a type of soil erosion where small, loose particles are lifted by the wind and transported to another location?

What is the term for the point in a planet's orbit where it is closest to the Sun?

What is the term for the zone of the ocean where light cannot penetrate, and temperatures are low and pressure is high?

What is the closest star to Earth?

What is the term for the process by which ice changes directly into water vapor without melting?

What is the name for a long, narrow body of water that connects two larger bodies of water and is often deeper than a strait?

What is the term for the process by which a river wears away the land and carries sediment downstream?

What is the name for a large, circular depression formed by the collapse of an underground cave or magma chamber?