Today there are some 4,300 religions in the world. Nearly 75 percent of the world’s population practices one of the five most influential religions of the world: Christianity, Buddhism, Hinduism, Islam, and Judaism. Christianity, which is based on the teachings of Jesus Christ, who preached in Palestine about 2,000 years ago, is the most widely practiced religion in the world today, with 2.1 billion followers. The second most practiced religion is Islam, with 1.3 billion followers.
- Which parts of the world have the fastest growing populations?
- Why is the Grand Canyon unique?
- What is Mount Rushmore?
- What is an avalanche?
- Can mountains grow and shrink?
- How many kinds of rock does Earth have?
- What was the Little Ice Age?
- How has the world’s climate changed over the years?
- Who were Gabriel Fahrenheit and Anders Celsius?
- If I don’t have a thermometer handy, can I count cricket chirps to calculate the temperature outside?
- What are dog days?
- Is there life on Mars?
- Was pond ice used as the first refrigerator?
- When were the hottest and coldest days of the year?
- How far can a tornado lift and carry items?
- Why are tornadoes so dangerous?
- Is it true that no two snowflakes are the same?
- Why are hurricanes called monster storms?
- Which snowstorm was the worst in U.S. history?
- Where is the driest place in the world?


