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Scientists study rocks and volcanoes to learn about volcanologists.

Volcanologists spend a lot of their time trying to figure out clues about Earth from rocks.

Volcanologists spend much of their time trying to decipher clues about Earth from rocks.

Volcanologists, or scientists who study volcanoes, examine rocks for clues about our planet.

Scientists still observe Mount St. Helens, which last erupted in 1985. The volcano gives off steam daily.

Mount St. Helens emits steam every day, even though there have been no eruptions since 1985.

Mount St. Helens may erupt at any moment—it’s spewing out steam every day!

Every day, Mount St. Helens emits steam. Volcanologists are monitoring its activity.

Earth’s climate has an inherent variability that makes it difficult to determine the human impact on it.

The climate of Earth is inherently variable, so it’s hard to determine the impact of humans.

Because Earth’s climate changes naturally, it is hard to know how human activity affects it.

People’s activities greatly affect Earth’s climate.

Coral reefs and ocean plants live cooperatively, so reefs grow in sunny areas close to the ocean’s surface.

Coral reefs and ocean plants live cooperatively, which is why reefs grow in sunny areas near the surface.

Coral reefs are found close to the sunny ocean surface because the plants they rely on need sunlight to grow.

Coral reefs don’t need sunlight. They do, however, need oxygen, which they get from the ocean plants.