[Tornadoes, Thunderstorms & Hurricanes] The map below shows the number of tornadoes per year (per 26,000 square km, for a 27-year period). Order the cities listed below based on the likelihood of their experiencing a tornado over the course of a year. Start with the least likely.

[From Big Bang to Blue Marble] Which of the following statements accurately describe processes or outcomes related to the condensation theory and Earth’s differentiation? (Select all that apply.)

[From Big Bang to Blue Marble] Which of the following scenarios best illustrates the difference between contact and field forces?

[From Big Bang to Blue Marble] A geologist discovers a solid material with an unordered atomic arrangement that formed from rapid cooling of molten rock. Which material classification is most accurate?

[Tornadoes, Thunderstorms & Hurricanes] Thunderstorms have long fascinated humans. The sensory stimulation of light and sound causes people to feel a range of emotions from exhilaration to fear. In this Exploration we will explore thunderstorms, how they form, and what can trigger the most violent of localized storms: the tornado. Thunderstorms require several “ingredients” to form. Which of the following environmental conditions will help lead to thunderstorm formation?

[Tornadoes, Thunderstorms & Hurricanes] Supercell thunderstorms can give rise to tornadoes. The image below shows an annotated radar image of a supercell. Identify the main downdraft and updraft locations as well as the likely location of tornado formation.  

[Tornadoes, Thunderstorms & Hurricanes] What type of lifting would likely be responsible for the squall line (the narrow band of thunderstorms running northeast to southwest) seen in the following image?  

[Tornadoes, Thunderstorms & Hurricanes] In April, you see this supercell making its way northeast across northern Alabama. Based on the general shape of the supercell, which town is located within the forward-flank downdraft? Click on the correct town on the map.

[Stellar Evolution] A main-sequence star, like our Sun, has a specific life cycle. In the following animation, click on the “Topics” menu and select “Intermediate Mass Stars.” Watch the animation, and then complete the problem that follows. Click here to open the animation in a new window. Place the following events of an intermediate-mass star’s life cycle in chronological order.

[Stellar Evolution] Stars are classified based on their size, temperature, and color. On each of the three scales below, click on the location that characterizes the Sun.