A star is a huge ball of hot glowing gas, like the Sun, and a planet is a world, like Earth. Stars produce their own light; they undergo nuclear reactions that burn hydrogen in their cores. But planets are lit by light from the Sun. When you look
- What is climate change, and how does it differ from global warming?
- Why is smog bad for us?
- What is smog?
- What is a tsunami?
- What are icequakes?
- When is earthquake season?
- What are earthquake zones?
- How do earthquakes happen?
- What is the Ring of Fire?
- How do volcanoes erupt?
- What is the difference between a planet and a moon?
- What is an estuary?
- Do rivers ever dry up?
- Why do planes disappear in the Bermuda Triangle?
- What are coral reefs?
- What is an iceberg?
- What is the difference between an ocean, a sea, a gulf, and a bay?
- Why is the ocean salty?
- How much of Earth is covered with land and water?
- Where is the deepest hole?
