Which of the following is a fossil fuel formed from the remains of ancient marine organisms?

What type of lens converges light rays to a single point?

What is the name for the process by which rocks are dissolved by acidic water, particularly effective on limestone and other carbonate rocks?

What is the name for a large, bowl-shaped depression in the Earth's surface, often caused by the impact of a meteorite?

In the context of electricity, what does AC stand for?

What is the primary source of energy for weather systems and atmospheric circulation?

Which of the following is an example of a first-class lever?

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 process by which a glacier melts and releases sediments it carried, shaping the landscape?

What is the acceleration due to gravity on the surface of the Earth?