Given a scientific passage and an answer, generate a question for the given answer.

Passage: Meteoroids are smaller than asteroids, ranging from the size of boulders to the size of sand grains. When meteoroids enter Earth's atmosphere, they vaporize, creating a trail of glowing gas called a meteor. If any of the meteoroid reaches Earth, the remaining object is called a meteorite. Answer: meteorite
When a meteoroid reaches earth, what is the remaining object called?

Passage: Only the top 200 meters or so of water receive enough sunlight for photosynthesis. This part of the water is called the photic zone. Below 200 meters, there is too little sunlight for photosynthesis to take place. This part of the water is called the aphotic zone. In this zone, food must come from other sources. It may be made by chemosynthesis, in which microorganisms use energy in chemicals instead of sunlight to make food. Or, food may drift down from the water above. Answer: photic zone
What is the top part of water able to receive enough sunlight for photosynthesis called?

Passage: Climate change in Earth history was due to natural processes. Recent global warming is due mainly to human actions. The burning of fossil fuels releases greenhouse gases into the air. This creates greater greenhouse effect and global warming. Answer: human actions
While climate change in earth history was due to natural processes, what is primarily to blame for recent global warming?