What is the primary function of the ozone layer in the Earth's atmosphere?

What is the chemical symbol for sodium?

In a chemical equation, what do the coefficients represent?

Which of the following is a measure of the total amount of dissolved salts in water, often used to determine water salinity?

Which of the following is an example of a non-contact force?

What force opposes the relative motion or tendency of such motion of two surfaces in contact?

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 the presence of the ionosphere and where auroras occur?

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

Which of Newton's laws states that an object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction unless acted upon by a net external force?