Nitrogen oxide emissions combine with water vapor, producing nitric acid a
Chemical Change
b
Physical Change

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Why are people not able to scuba dive in the deep part of the ocean

Why are people not able to skip a dive to the deepest part of the ocean