Answer:
a
because the mechanical wave is when it goes over and over again
- rocket science
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Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust. Convection currents also stress the lithosphere above, and the cracking that often results manifests as earthquakes.
Answer:
positive ion
Explanation:
due to the fact it loses electrons there is 2 more protons than electrons
