Answer:
If the magma has high gas content and high viscosity, the gas will expand in an explosive fashion and break the liquid into clots that fly through the air and cool along their path through the atmosphere. Alternatively it blast out solid pieces of rock that once formed the volcanic edifice.
Explanation:
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Salt water is a homogeneous mixture or a solution.
I'm unsure, but it could be caused by space particles that land on it. Things such as space dust or meteorites.