line where earth and sky meet. Limits of someone's experience or understanding.

Present and able to be used.

To travel to a place to discover more about it.

process of taking air into and expelling it from lungs. To stop moving so one can rest.

Used to add new (often different) information.

From one end or side of something to the other. expressing movement into one side and out of other side of opening etc.. Over, in, across an entire thing or place.

flowing naturally or supplied to building through pipes and taps. The act of moving your legs to move quickly. To flow in a certain direction, like a liquid.

devoted to task or purpose. To state a person's name in book, song, in respect.

length or portion of time. Set amount of times during which events take place.

picture made using camera, in which image is focused on to light-sensitive material. Pictures taken with a camera. To take a picture with a camera.

Vehicle capable of traveling to outer space.

science which deals with physical structure and substance of earth, their history, and processes.

optical instrument designed to make distant objects appear nearer, containing arrangement of lenses, or of curved mirrors and lenses. Tube-shaped device used to see a great distance. slide or cause to slide into itself, so that it becomes smaller.

To watch carefully; to make a comment.

used for emphasis with following adjective functioning as adverb. thing that is unspecified or unknown.