Improvements in geological observation technologies have made it easier for scientists to locate resources in Earth's crust. These technologies have allowed for an increase in availability of which resource? OPTIONS:
- wind power
- solar energy
- fossil fuel
- tidal energy
A: fossil fuel

What is the main reason we can see the Moon? OPTIONS:
- The Moon reflects light from the Earth.
- The Moon reflects the light from the Sun.
- The Moon produces its own light.
- The Moon is larger than stars.
A: The Moon reflects the light from the Sun.

A student flips a coin four times. It lands "heads" up three times. The student concludes that the coin will land "heads" up three times out of four. What will make the conclusion more accurate? OPTIONS:
- substituting a different coin
- flipping the coin twenty more times
- taping a weight to one side of the coin
- flipping the coin over a smoother surface
A: flipping the coin twenty more times

Which of the following has the greatest effect on the ability of soil to hold water? OPTIONS:
- the age of the soil particles
- the size of the soil particles
- the color of the soil particles
- the luster of the soil particles
A:
the size of the soil particles