Which of the fossils would be the best index fossil? Select one from the list on the right.  

Rocks deform in response to applied stress. Deformation is usually either brittle or ductile. Earthquakes occur when rocks deform in a brittle fashion. Select the images below that represent brittle deformation.

Based on the amplitudes you just recorded (Kansas City, 4 mm; Charlotte, 1 mm; and Birmingham, 10 mm), which station is closest to the epicenter of the earthquake?  

Numerical dating commonly relies on the use of isotopes. In the image below, the green squares represent parent atoms and the blue represent daughter atoms from radioactive decay. The ratio given at the bottom is the parent:daughter ratio. How many half-lives have elapsed to produce the ratio shown in the image?

The accumulation of liquid water played a crucial role in the development of life on our planet. But where did the water come from? Place the following events in order to show how our oceans formed.

Currently, sea level is rising about 0.31 cm/year. Since the disappearance of the last remnants of the North American (Laurentide) Ice Sheet 7,000 years ago, sea level has risen 4 meters (purple box). How does this historical rate (4 meters of rise over 7,000 years) compare to the current rate of sea-level rise (0.31 cm/year)?

The product of longshore drift along a sandy coast is the creation of a spit, a narrow bar of sand reaching out into a bay or channel. This is a picture of a recently formed sand spit. Which direction was longshore drift moving to create the spit?

The bodies of water that cover our planet are broken up by landmasses. The large expanses that are bordered by different continents are called oceans. Smaller bodies of saltwater that are at least partially surrounded by land are called either seas, bays, or gulfs. Label the main bodies of water shown in the image below.

The following image shows surface salinity values of ocean waters around the globe. Place the climate zones in order from least to most saline based on the image.

Thermohaline circulation can explain some of the surface currents we see in our oceans, but it does not explain the prevalence of gyres (large, circular currents). What causes gyres to form?