All elements can be classified as metals, metalloids, or nonmetals
is an outer shell electron that is associated with an atom
Answer:
2. 
1. 
Explanation:
2. <em>Seismic</em> <em>waves</em> vibrate from side to
side and up and down. They go through solids only, travel slower than <em>Pressure</em> [or <em>Primary</em>] <em>waves</em>, which arrive second, and shake the ground violently.
1. A <em>Ritcher</em><em> </em><em>scale</em><em> </em>senses the magnitude of earthquakes.
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Answer:
Explanation:
Exothermic: the surrounds feel warmer. A wood fire stove is a good example of an exothermic reaction. You can feel the heat on your hands. It's exothermic.
Endothermic is exactly the opposite. The reaction takes place, but the heat comes from the surroundings. When you touch something that goes through an endothermic reaction, it feels much cooler.
This reaction, just by definition is endothermic.