What is the chemical symbol for water?

• H2O3

• H2O

• H2O2

• O2H

What planet is known as the Red Planet?

• Jupiter

• Venus

• Mars

• Saturn

What gas do plants absorb from the atmosphere?

• Hydrogen

• Carbon dioxide

• Nitrogen

• Oxygen

What is the process by which plants make their food?

• Photosynthesis

• Transpiration

• Respiration

• Digestion

What is the largest organ in the human body?

• Heart

• Skin

• Liver

• Lungs

What is the speed of light in a vacuum?

• 150,000,000 meters per second

• 300,000,000 meters per second

• 299,792,458 meters per second

• 299,792 kilometers per second

What are the three states of matter?

• plasma, vapor, foam

• solid, liquid, plasma

• gas, liquid, crystal

• solid, liquid, gas

What is the powerhouse of the cell?

• Nucleus

• Mitochondria

• Chloroplast

• Ribosome

What is the main source of energy for the Earth?

• Nuclear fusion

• Geothermal energy

• The Sun

• The Moon

What is the force that pulls objects toward the Earth?

• Magnetism

• Friction

• Gravity

• Electromagnetism