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?

Using complete sentences and proper grammar, name AND describe two (2) methods used to mitigate (lessen) flood hazards.

Which characteristics do researchers use to classify the Earth’s atmospheric layers?

Major layers of the atmosphere are determined by

The polar front is the boundary between

Classes are canceled because of a blizzard! This storm is an example of

Prior to the late 18th century, the focus of sea exploration was __________, whereas in the late 18th century, __________ became important.