Answer:
Calcium has an Atomic number of 20 and Atomic mass of 40.078 u
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When perfume is sprayed in a room the particles of perfume diffuse with the particles in the air.
Answer:When a substance undergoes a chemical change some of the chemical changes can be reversed with a chemical change.
Explanation:
A chemical change changes all of the element but some chemical changes but very few can be changed back to its original substance only with a chemical change.
1. weathering and erosion on Earth's surface is always breaking Rock down 2. Transport 3. Deposition 4. Compaction and cementation. 5. Metamorphism 6. rock melt
Answer: Lexington and Concord
Explanation: The British were trying to find weapons and could not find them.
