something that happens suddenly and often causes people to get hurt

made without mistakes

a chemical compound that dissolves in water, tastes sour, and makes blue litmus paper turn red.  Strong acids can burn your skin. 

rain that has acid in it because of air pollution 

a thing done

to change in order to fit new conditions

a change that a living thing goes through so it fits better with its environment

1. designed with rounded edges so as to reduce wind drag and increase fuel efficiency
2. made to move through the air very easily and quickly

the science of the motion of gases (especially air) and their effects on objects

a new design of a wing that is able to bend and stretch

the art or science of flight

the science and technology of jet flight or space travel

the second largest continent, south of Europe between the Atlantic and Indian oceans

movable flaps on the wings of an airplane that are used to control the plane's rolling and banking movements

things that hurt or make air dirty

1. how much air presses or pushes on anything
2. the push of air

someone who is allowed to give instructions to aircraft

1. any machine used for flying
2. a vehicle that flies through the air

a company that owns airplanes

a room in which air pressure may be changed

a place where aircraft load and unload passengers in an airport

a warning of danger

a condition in which coughing, sneezing, or a rash develops when a person comes in contact with certain things

the height of something above the ground

a light, silver colored metal

using moving parts to show changing information

anything that keeps something steady or in place

not having enough iron in the blood

the shape made by two straight lines that meet at one point

a continent around the South Pole

a wire that receives radio and television signals

a drug that kills bacteria and is used to cure infections and disease

to agree and say that something is okay

the amount or size of a surface

made by a human being, not by nature; not natural

a process in which the job of making a product is divided into many smaller jobs. Each worker assembles the same part on every item made. The workers stay in the same place while the items pass by on a moving belt or track.

1. a rocky space object that can be a few feet wide to several hundred miles wide. Most asteroids in our solar system orbit in a belt between Mars and Jupiter.
2. one of the many small planets that move in orbits around the Sun. The asteroids orbit in an area between Mars and Jupiter.

rocks that fly through space

1. a person who rides in a space vehicle
2. a person trained to make spaceflights
3. a person trained to travel and work in space

someone who studies the stars, planets, and space

the study of stars, planets, and space

1. all the air around the Earth
2. the gases around any planet
3. the layer of gases that surrounds the Earth

one of the tiny particles of which all things are made

decrease in size or wasting away of a body part or tissue

moving or working by itself

a system that flies a plane using a program instead of people

a large mass of snow, ice, or earth that suddenly moves down the side of a mountain

the science, skill, or work of flying airplanes