Since both numbers contain 2 significant digits the answer will contain 2 significant digits:
Answer: b 1.9 x 104
Aquifers and rivers and streams and places with water and stuff like that
Total number of atoms = 5
<h3>Further explanation
</h3>
The formula of a compound shows the composition of the constituent elements
CaCO₃ is composed of 3 types of atoms, namely Ca, C and O
The amounts of each of these atoms in the compound CaCO₃:
Then total number of atoms :

matter can take be one of the three states which are; (Solid, Liquid, Gas)
Think about water, it can be a Solid (Ice) a Liquid (not frozen obviously) and a Gas (when it evaporates)
Answer:
The answer is supposed to be "Electron cloud" or "Electon".