How many of the planets are smaller than Earth?Ĥ0. One year or 365 days – 365 days, 5 hours, 59 minutes, and 16 seconds to be exactģ9. How long does it take the Earth to rotate around the Sun? What are the hot balls of light that appear in the night sky called?ģ8. Who was the first human to step on the Moon?ģ7. Why do things fall when you drop them?īecause of the gravitational force of theģ6. Which planet in our Solar System is known for having a ring?ģ5. How many stars are there in the Milky Way?ģ4. Related: 65 Science Quiz For Kids of Grades I to X Space Trivia Questionsģ3. What is the smallest bone in the human body? How many bones does the human body have?ģ1. What is the longest bone in the human body?ģ0. Which sea animal has tentacles that sting?Ģ9. What kind of mollusk holds a pearl in its shell?Ģ8. How many tentacles does an octopus have?Ģ6. What is a human’s average temperature?Ģ5. At what temperature does water freeze?Ģ4. and left and right ventricles i X Hollow chambers located at the lower region of the heart that transport blood out of the heart.Ģ3. How many chambers are there in a human heart?įour – left and right atria i X Chambers present at the upper region of the heart that play a crucial role in blood circulation. What is the hardest natural substance in the world?Ģ2. How many bones does a worm have in their bodies?Ģ1. What are the droplets of water (rain, snow, sleet, or hail) that form in the atmosphere and fall back to the Earth called?Ģ0. How many breaths do the average human take in a day?ġ8.

What is the largest internal organ in the human body?ġ7. How many elements are in the periodic table?ġ6. If you have arachnophobia i X A fear of spiders., which animal are you scared of?ġ5. Nitrogen, which makes up over 78% of the Earth’s atmosphereġ4. Which is the most abundant natural gas in our atmosphere? How many muscles are there in the human body?ġ3. What do you call a person who studies weather?ġ2. Tooth enamel i X The hard protective covering of teeth.ġ1. What is the hardest substance in our body? What is precipitation that falls in the form of ice crystals called?ĩ. What is the largest known living land animal?Ĩ. How many teeth do most adult humans have?ħ.

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