FILL IN THE BLANKS 1. Gravity is a force that attracts all objects with to all other objects with .

2. It is proportional to the product of the two masses.

3. As mass increases, gravity . As mass decreases, gravity .

4. It is proportional to the square of the distance separating them.

5. As distance increases, gravity . As distance decreases, gravity .

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.