What is the name for a wave that requires energy to produce it and a medium to travel through?

Acube has a volume of 2011 cubic inches. what is the angle measure between a side of a cube and its interior diagonal?

If you touch a hot light bulb and get burned, that is an example of a. radiation b. convection c. conduction

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults