What determines the length of a geologic time period?

fossil record

material density

meteors and rocks

radioactive materials

7. The earth's most important nonrenewable energy source is A natural gas OB oil C the sun OD coal

The tympanic membrane of the ear:

Which part of the earth system contains continents?

What is at the back of the moon?

Most causes of speciation are relatively slow, in that the differences separating species take many generations to accrue and establish reproductive isolation. Which of the following is most likely to produce a species in just a few generations? a.

What are dry docks and what happens there? (3)

A boy wins a trip. The first thing he notices when he arrives is the cold temperatures and the thick coniferous forests. It snows during his visit. The area averages 35cm to 100 cm of precipitation per year.

If an Earthquake registered high on the Richter scale and low on the Mercalli scale, then it occurred most likely in which type of location?

What is the name of the largest lake in central america?

Although there are no glacier in florida, how have glaciers affected Florida?