All radioactivity is man-made.
Air is a mixture of gases. Most of the Earth’s atmosphere consists of which gas?
Which of the following is in order of increasing size?
atoms, molecules, electrons
electrons, atoms, molecules
molecules, electrons, atoms
atoms, electrons, molecules
Sunscreen protects your skin from which form of radiation?
NaCl is the chemical formula for which common chemical?
sucrose or sugar
sodium chloride or table salt
sodium bicarbonate or baking soda
The Earth, Sun, and all of the Solar System are part of the Milky Way galaxy. What is the shape of the Milky Way?
Frogs are vertebrates, which means they have backbones. To which group of vertebrates do frogs belong?
An igneous rock is one that:
formed from compressed sediments
formed as a result of pressure and temperature
formed from cooled lava or magma
fell to Earth as a meteorite
Cells of bacteria (prokaryotes) differ from cells of plants and animals (eukaryotes) in which way?
Bacterial cells do not have organelles.
Only bacterial cells may have a cell wall.
All bacterial cells are unable to move.
Bacterial cells do not have DNA.
The second planet from the Sun is:
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