Match the following terms to their definitions.
1. empirical evidence
data or facts that can be observed
2. independent variable
the variable that changes in response to experimentation
3. dependent variable
the quantity in an experiment that remains unchanged
4. control
a proposed explanation for a scientific problem
5. hypothesis
the experimental factor that is changed by the scientist

Explanation:

1.empirical evidence  

data or facts that can be observed  

2.independent variable  

 the experimental factor that is changed by the scientist

3.dependent variable  

the variable that changes in response to experimentation

4.control  

the quantity in an experiment that remains unchanged

5.hypothesis  a proposed explanation for a scientific problem

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.