that is replaced naturally or controlled carefully and can therefore be used without the risk of finishing it all
15
heat
the level of temperature
15
turbine
a machine or an engine that receives its power from a wheel that is turned by the pressure of water, air or gas
15
machine
a piece of equipment with moving parts that is designed to do a particular job. The power used to work a machine may be electricity, steam, gas, etc....
15
generator
a machine for producing electricity
15
electricity
a form of energy to power machines or devices.
15
discuss
to talk about something with somebody, especially in order to decide something
15
toward
in the direction of somebody/something
15
movement
an act of moving the body or part of the body
15
tide
the flow of water that happens as the sea rises and falls
15
amount
a quantity of something
15
solar cell
a device that converts light and heat energy from the sun into electricity
15
satellite
an electronic device that is sent into space and moves around the earth or another planet. It is used for communicating by radio, television, etc. and...
15
battery
a device that is placed inside a car engine, clock, radio, etc. and that produces the electricity that makes it work
15
reflect
to show the image of somebody/something on the surface of something such as a mirror, water or glass