Which organ pumps oxygenated blood to the body?
A. Lungs
B. Kidney
C. Heart
D. Liver
The natural satellite of the Earth is:
A. Mars
B. Moon
C. Venus
D. Sun
Lightning is caused by:
A. Friction between clouds
B. Electric discharge
C. Earthquakes
D. Magnetic storms
Which gas makes up about 21% of Earth’s atmosphere?
A. Nitrogen
B. Carbon dioxide
C. Oxygen
D. Argon
The process by which plants lose water through leaves is called:
A. Evaporation
B. Transpiration
C. Condensation
D. Sublimation
The largest planet in our solar system is:
A. Earth
B. Saturn
C. Jupiter
D. Uranus
The unit of electric resistance is:
A. Ampere
B. Ohm
C. Volt
D. Watt
The part of the eye that focuses light on the retina is:
A. Cornea
B. Iris
C. Lens
D. Pupil
The gas used in balloons to make them float is:
A. Oxygen
B. Nitrogen
C. Helium
D. Carbon dioxide
The study of weather is called:
A. Seismology
B. Meteorology
C. Volcanology
D. Oceanography