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31.
Riddles
Chemical element with the atomic number 1
What is the name of the chemical element with the atomic number 1?
The name of the chemical element with the atomic number 1 is hydrogen.
32.
Riddles
force that attracts objects towards the center riddle
What is the force that attracts objects towards the center of the Earth?
Gravity.
33.
Riddles
Plants absorb water through their roots riddleÂ
What is the process by which plants absorb water through their roots? Â
Osmosis.Â
34.
Riddles
Largest bone in the human body riddle
What is the name of the largest bone in the human body?
 femur
35.
Riddles
Outer layer of the Earth's surface riddle
What is the name of the outer layer of the Earth's surface?
 crust
36.
Riddles
Chemical symbol for iron
What is the chemical symbol for iron?Â
The chemical symbol for iron is Fe.
37.
Riddles
Organism takes in oxygen and releases carbon dioxide
What is the process by which an organism takes in oxygen and releases carbon dioxide?
Respiration.
38.
Riddles
Coolest planet on Earth riddle
What is the coolest planet on earth?
UranusÂ
39.
Riddles
Chemical formula for table saltÂ
What is the chemical formula for table salt?Â
The chemical formula for table salt is NaCl (sodium chloride).Â
40.
Riddles
Cannot be bought at a gas stationÂ
I am a gas that is helpful to plants, but I cannot be bought at a gas station. What am I?Â
Carbon dioxideÂ
41.
Riddles
I can measure heatÂ
I am a god, a planet, and I can measure heat. What am I?Â
MercuryÂ
42.
Riddles
I am a lack of space riddleÂ
I touch your face. I am in your words. I am a lack of space and beloved by birds. What am I?Â
AirÂ
43.
Riddles
Chemical formula for sodium hydroxide riddle
What is the chemical formula for sodium hydroxide?
The chemical formula for sodium hydroxide is NaOH.