A covalent is chemical bond that involves the sharing of electron pairs between atoms
In order for a chemical reaction to being, two reactants must come into contact with one another. Reactions<span> occur when two or more molecules interact and the molecules change. Bonds between atoms are broken and created to form new molecules</span>
Answer:
They can use radioactive dating
Explanation:
To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
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Answer:
The water cycle
Explanation:
<em>Possible answers include that water is stored as ice and snow on the ground during the water cycle. Water is also stored in clouds until precipitation occurs, which transfers water from the atmosphere to the ground. On the Earth's surface, water can be stored in liquid form in streams, rivers, lakes, and oceans.</em>
