axis - n. the imaginary straight line that something (such as the Earth) turns around

briefcase - n. a flat case that is used for carrying papers or books

core - n. the central part of a fruit (such as an apple) that contains the seeds

curveball - n. a pitch that is thrown with spin so that the ball curves in the air

desk - n. a piece of furniture that is like a table and often has drawers

dig - v. to move soil, sand, snow, etc., in order to create a hole

geological - adj. a science that studies rocks, layers of soil, etc., in order to learn about the history of the Earth and its life

mission - n. a task or job that someone is given to do

spacecraft - n. a vehicle that is used for travel in outer space

vibration - n. a continuous slight shaking movement