Some metamorphic rocks are not foliated because of mineral growth or recrystallization without a preferred orientation. Below are the names of several metamorphic rocks. Identify whether each rock has foliation by dragging each name to the correct box.

  There is a hole in the ozone layer? Great. What can possibly be done? This final video shows reason to be optimistic, not just about the ozone layer, but about humanity’s ability to act. The following video shows the location and intensity of the ozone hole from 1979 to 2013. Take note of the line graph, included below, that shows the minimum concentration for each year. Click here to open the video with closed captions in a new window. Since 1993, what has the trend been for minimum ozone concentrations at the South Pole?

Place the following metamorphic rocks in order from lowest-grade to highest-grade metamorphism

In this activity, we will use data from three seismic stations to determine the epicenter of the earthquake. We will use this interactive map to answer the remaining questions in this Guided Learning Exploration. Step 1. Select “Interactivity.” For the three seismic stations, select Kansas City as the red city, Charlotte as the green, and Birmingham as the blue. Then select “Accept.” Step 2. Select Kansas City and then drag the green line to where the S-wave arrives (shown on image below). The difference in time between the P-wave (yellow line) and S-wave (green line) is the S-P interval. Then select “Accept.” What is the S-P interval for the earthquake as recorded by the Kansas City, MO, seismic station?

  Atmospheric concentrations of minor gases are often given in ppm (parts per million). For example, carbon dioxide is reported at 415 ppm. What does this concentration look like? Select the image below that best approximates a concentration of 415 ppm.

In the previous section, we learned about the different types of seismic waves. Below are several illustrations showing how these waves would be felt by people at the surface. Match the seismic wave with the type of motion you would feel at the Earth’s surface. The direction of wave propagation is important!

The following cross section shows several stratigraphic layers and the types of fossils found within each layer. Place the fossils in order of oldest to youngest, based on when each fossil first appears in the rock record.

  The Earth’s atmosphere is composed of many different gases. Place the following gases in order of abundance from most abundant to least abundant.

Step 6. Select “Find KM” and then “Map.” Next, select the red dot for each city and drag out a circle with a radius representing the distance you calculated to the epicenter of the earthquake Where is the epicenter of the earthquake?

The graph below is similar to the graph you used in the last two questions, except instead of showing the facies, it shows the grade of metamorphism and the likely minerals formed at each grade. The graph advances from low-grade metamorphism in the upper left to high-grade metamorphism in the lower right. Use the graph to answer the following question: If you started out with a basalt protolith and subjected the rock to high-grade metamorphism, which of the following minerals would you likely produce?