A new well is put into a small community that previously depended on surface water for their needs. Soon after, it is determined that members of the community show characteristics of arsenic poisoning, so the well water is tested and found to have significant amounts of arsenic. Is it possible that the well was naturally contaminated?

Why does the Moon have phases?

If a large airport, complete with paved runways, parking lots, and many new structures, is built next to a river, what might the effect be?

Which of the following terms in regards to chromosome number represents a healthy fertilized egg?

What type of characteristics would be best used to describe wind?

A person is digging a hole when it suddenly starts to fill with water. What has this person found?

Water in underground sediment or rock is referred to as

Which gas was 15% of the Earth’s first atmosphere and is predominant in the second, third, and modern atmospheres?

Which of the following identifies an aquitard? (For clarity: A contains sand on clay, B and D are medium-grey shaded (sandy) layers, C is darkest shaded layer (clay).

Which of the following best explains why we hear thunder?