[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.

[Stellar Evolution] What force will be responsible for expanding the Sun into a red giant?

[Stellar Evolution] What is the most massive element that can be formed through stellar fusion?

[Planetary Geology] The materials that make up the Earth change as you move from the crust, down through the mantle, and ultimately into the Earth’s core. Select the image of the rock below that you would most likely find in the upper part of the continental crust.

[Stellar Evolution] Whereas spectral classes describe a star’s surface temperature, the absolute magnitude of a star describes the star’s true brightness, or luminosity. The image below shows the same 60-watt lightbulb at various distances from the viewer. Which of the following statements accurately describes the magnitude of the lightbulbs as shown?

[Tornadoes, Thunderstorms & Hurricanes] Buoyant air updrafts often lead to thunderstorm development. Place the following images in the correct order below to show the life cycle of a thunderstorm.      

[Climate Change] Another anthropogenic change the Earth experiences is pollution. Match the type of pollution with the anthropogenic cause.  

[Stellar Evolution] Stars that are more massive than our Sun will undergo a different life cycle. In the following animation, click on the “Topics” menu and select “Massive 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 a massive star’s life cycle in chronological order.  

[Planetary Geology] Differentiation led to the Earth separating into layers based on density. Drag the layer labels to the correct locations on the triangular schematic of Earth’s interior below.