When heat energy is added, two changes are observed: change a: solid changes to a liquid. change b: solid changes directly to a gas. what are the names for phase changes a and b?
a-- a is freezing and b is condensation.
b--a is freezing and b is sublimation.
c-- a is melting and b is condensation.
d--a is melting and b is sublimation.
the answer is d

The answer is d-- A is melting and B is sublimation.

Explanation:

A is melting because a solid is changing into a fluid and B is sublimation because a solid changing straight into a gas.

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.