Wind and rain will do this to the Earth's surface if there is no plant cover.
What is erosion?
The amount of the moon that is possible to be seen any any one time.
What is one half?
How tightly packed the mass of an object is in a certain volume.
What is density?
What are species?
This is smaller than a galaxy but larger than a star.
What is a solar system?
The color of light is based on this.
What is the frequency?
The organelle which burns energy molecules to produce energy for the cell.
What is mitochondria?
This is an idea that the evidence seems to suggest.
What is a claim.
When one tectonic plate is pushed underneath another one until it melts into the mantle.
What is the subduction?
These are the three bodies that align in this order to create a solar eclipse in Prescott.
What is Earth - moon - Sun?
When a roller coaster reaches the top of a hill, it has its maximum of this type of energy.
What is potential?
The basic piece of information coded on DNA that determines the shape of proteins.
What is a gene?
A repeated sequence of events that seems to suggest cause and effect.
What is a pattern
One of the four Spheres of the Earth that includes glaciers.
What is the hydrosphere?
The second half of the lunar cycle in which it appears to be getting smaller.
What what is waning?
One is a measure of the force of gravity, the other is a measure of matter.
What is weight and mass?
Thee passage of genetic instructions from one generation to another.
What is heredity?
This is when a scientist (or engineer) repeats his own experiment (or design).
What is iteration?
Unlike weather, which can change daily, this is the average pattern of atmospheric conditions such as temperature.
What is climate?
The length of a lunar day.
What is one month (29 days)?
Water boiling is an example of this kind of change.
What is a physical change?
Failure of a species to adapt to a changing environment may lead to this.
What is extinction?