When coal is burned, how long does it take for it to release carbon dioxide into the atmosphere?

Early earth's heavy rains slowly filled low lying areas forming oceans. This reduces the water vapor in the air and the amount of ______, which dissolved in water.

What is the difference between Earth's current atmosphere and its atmosphere in the past that allowed dragonflies to become much larger?

Earth's EARLIEST atmosphere was relatively short-lived and contained the gases _____

Scientists believe that nuclear fusion within stars creates elements, including those heavier than lithium. How did these elements appear on Earth?

Why are rock samples from the moon helpful in determining the relative age of the solar system?

Humans cannot survive without clean, fresh water. What is the source of MOST of the water in the atmosphere?

Which atmospheric phenomena are created by the interaction of charged particles with Earth's magnetosphere?

Earth's rotation spins Earth's liquid metal outer core around its solid metal inner core. How does this phenomenon make life on Earth possible?

Which part of Earth's structure exists in the solid phase due to low temperatures?

Which property of Earth's interior keeps the innermost part in a solid state?

Earth is composed of layers of material with different properties. Which is MOST likely to be in constant motion?

Which of the following may form when carbon from decayed organic matter is buried in the right geological conditions?

Which of the following BEST represents how oxygen first became prevalent in Earth's atmosphere?

Which of the following sources of energy drives the movement of carbon from biological reservoirs in organic matter to chemical reservoirs in fossil fuels?

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