Earth’s secondary atmosphere was mostly composed of carbon dioxide and water vapor. After the formation of the oceans, the atmosphere was mostly composed of nitrogen and carbon dioxide. Describe how the formation of the oceans altered the composition of the atmosphere.

Of the following, which features are associated with karst landscapes? Select all that apply

Why was the Cambrian explosion significant in terms of the fossil record?

Which was the largest mass extinction event in Earth’s history?

50-year floods occur precisely every 50 years.

Which of the following metamorphic rocks would represent the lowest metamorphic grade?

In your own words, what is the difference between earthquake magnitude and intensity?

Which of the following is a potential sink (or output) of sand in a beach sand budget? Select all that apply

The Sun exerts the greatest tide generating force because it has more mass than the Moon. 

Which of the following is NOT a factor that promotes dune growth and stability?