Many nations use oceans to drill for oil which is a non-renewable resource that often damages the ocean and can cause major problems for the biome. This means also that more oil is used then so that's bad for the environment too. Sometimes there is an oil spill which kills many animals and plants that live in the ocean and cause a natural disaster. Even renewable resources from oceans like using water and dams to make electricity can be problematic because the water gets polluted. It would be best if countries switched to things like solar energy and wind energy.
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There are many ways to identify when a physical change has occurred. This can be done by recognizing reversible changes or eliminating chemical changes.
Physical changes involve state changes in matter and energy. These changes cause the matter to change form, but no new material is generated. Matter may alter in size, shape and color. When substances are combined but do not chemically react, physical changes take place.
A physical change can be recognized if it is reversible, especially if it involves a phase transition. For instance, if water is frozen into an ice cube, it can be melted back into water.
Sometimes eliminating the potential of a chemical transformation makes it easier to spot a physical change. There may be a number of signs that a chemical reaction has taken place.
To read more about chemical change see:
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Full question: How to identify physical change?
Earth rotates in and out of a tidal bulge twice a day.
Answer: New and improved technology
Explanation: With more development tools we can significantly decrease manual labor which then causes us to increase our production time. As we improve this technology we are able to shift to more commercial production producing more for our larger population rather than simply for oneself and or their family
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