10. 200 Why does the Sun look like it is moving across the sky? Why does the Stars look like they are moving across the night sky? Why does the Moon look like it is moving across the night sky?
11. 200 How long does it take for the Earth to rotate on its axis? How long does it take for the Earth to ORBIT (go around) the sun?
18. 400 While walking along the path, she spotted a mysterious looking cave. Upon close inspection, she realized that the cave was filled with glorious gemstones that turns color every 2 minutes. She decided to take one home.
19. 400 Christopher had a birthday party. He invited 6 friends. He bought some goodies to give to his friends. He bought 24 pencils, 12 erasers, and 18 notepads. How many pencil does each friend get? Erasers? Notepad?
20. 400 Name all the rock planets in the Solar System
21. 400 There are 20 students in the class. The teacher put students in 5 separate groups with same number in each group. Then each group is asked to fold 10 airplanes. How many airplanes are there in all?
