surface

The outer parts or appearance of something

The inside part of something, like a room or box

Under the ground or below the top layer of a place

A feeling that is hidden but easy to notice

To look below the surface to find the real reasons

The outer layer of the Earth that includes land and oceans where life lives

A weapon launched from the ground to hit targets in the air

A weapon launched from the ground or a ship to destroy aircraft in the sky

The total outside area of a solid object or a specific area inside a border

A force that makes a liquid surface pull together like a skin

A flat surface like a table or countertop where you do work

A military ship that moves and fights on the water's surface, not underwater

The top layer of a road that vehicles drive on

The top side of an object that you can touch or see

A movable part on a plane that the pilot moves to steer or keep it steady

A wall or other area that stands straight up from the ground

A set of weapons and equipment that shoots rockets at planes

A flat area covered with hard material like concrete or stones

The top layer of ground that has the most plant food

An area of closely cut grass around a golf hole where players hit the ball toward the hole

A weapon or missile a plane uses to hit targets on the ground

A soft background sound made when a record player's needle rubs a vinyl record

A weapon that a plane fires to hit a target on the ground

A U.S. Navy center that develops and tests weapons and systems for ships

The part of science that studies how substances act where two materials meet, like liquid and air

Letters and packages sent by land or sea instead of by air

Equipment on a ship that finds and follows other ships

A machine in power plants that cools steam from a turbine and turns it into water

A smooth, non-stick coating that keeps food from sticking

A machine that pulls skiers up a slope while they stay on the ground

A forest fire that burns leaves and small plants, not large trees

A chemical in soaps and detergents that helps water mix with oil

A shape formed when a straight line moves through space

A pull at the surface between two liquids that do not mix, like oil and water

A surface in three-dimensional space made by an equation with squared terms in x, y, and z

An instrument with a pointed tool on an adjustable stand used to mark and check flat surfaces like metal plates

Small amounts of gas or liquid stick to a solid surface and form a thin layer

Causes liquids or tiny bits to stick to a surface