Which type of reaction involves the combination of two or more substances to form a new substance?

In optics, what is the term for the point at which parallel light rays either converge or appear to diverge after passing through a lens?

Which of the following is an example of a heterogeneous mixture?

Which of the following is a noble gas?

Which of the following is a characteristic of acids?

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

What is the main function of the kidneys in the human body?

Which type of weathering involves the expansion and contraction of rocks due to temperature changes, leading to the breaking of rock into smaller fragments?

What is the name of the region in space where the gravitational influence of a celestial body, like a planet or star, is dominant?

What is the purpose of the cilia in the respiratory system?