Renewable resources are resources that can be replaced by natural resources in a period less than _______ years.

Coal, oil and natural gas are all ________ fuels

The advantage to water (hydropower) is that it is __________ and nonpolluting.

The disadvantage to water (hydropower) is that it is _________________

Pollution that results when the gases released by burning oil and coal mix with water in the air

Materials that can harm living things by interfering with life processes

What is the center of an atom called

What is the darkest part of the shadow

What is the breaking of white light into all the colors of the visible spectrum

One of the main functions of microorganisms in an ecosystem is to

an experiment in which only one variable is manipulated at a time.

a statement that describes what scientists expect to happen every time under a particular set of conditions.

facts,figures,and other evidence gathered

a line that runs left to right along the bottom of a graph, on which the manipulated variable (or independent variable) is labeled.

you see your reflection in a mirror because..

One of the most important functions of microorganisms in an ecosystem is that they

Which would be the best material you could use to separate heat from cold?

One way light and sound differ is

Anton van Leeuwenhoek discovered