Two pieces of the same metal are placed on a table. The pieces of metal have the same density, mass, and texture. Which characteristic must be the ONLY difference between the two samples? OPTIONS:
- They have different dimensions.
- They have different boiling points.
- They are made up of a different type of matter.
- They contain a different amount of matter per unit volume.
A: They have different dimensions.

Marni runs 1500 meters around the school track. What does she need to know in order to find out her speed? OPTIONS:
- her time from start to finish
- the number of steps she took
- her heart rate at the finish line
- the direction she began running
A: her time from start to finish

A decrease in air temperature from 60°F to 35°F would most likely cause a person to OPTIONS:
- shiver
- sweat
- blink his eyes
- feel sleepy
A: shiver

The Milky Way is a part of 30 or more galaxies called the Local Group. Which would be the most likely reason these galaxies are considered to be part of the Local Group? OPTIONS:
- They are all the same type of galaxy.
- They all have the same number of stars.
- They are all attracted to each other by gravity.
- They can all be seen without the aid of a telescope.
A:
They are all attracted to each other by gravity.