A volcanic arc is a chain of volcanoes formed above a subducting plate, positioned in an arc shape as seen from above. Offshore volcanoes form islands, resulting in a volcanic island arc.
Astronauts experience weightlessness which is the apparent loss of weight of an object that is falling in gravitational field
IVA: nonmetal/other metals VIIA:halogens VIII: Nobel Gases
Lead is an E (element) and can be found on the periodic table.
Number
The atomic number is the number of protons in one atom of an element.
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