A theory is a proposed explanation for an observation
Because the physical appearance change hope this helps
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The Earth's crust or is it the continental plates one of the two but they push against each other costing a tsunami.
false,
sodium has a vigorous reaction with water.
This can be observed by putting a piece of sodium in water,
it moves swiftly across the surface of water and reacts violently.
Answer:
To tell if something is an acid or a base, you can use a chemical called an indicator. An indicator changes color when it encounters an acid or base. There are many different types of indicators, some that are liquids and others that are concentrated on little strips of "litmus" paper.
Explanation:
