Coral reefs are here in our world, and we have a duty to protect them. Things like fertilizers and pesticides are the things that are harming them, which comes from humans and causes the reefs to get sick.
If that answer isn't enough, then maybe this one will help?
Over fishing occurs when humans fish more than they should in a coral reef and eventually the fish can no longer thrive, and they simply disappear. Not only is this bad for the reef, because it too will then die, but them humans will no longer have that source of fish, which is what man groups of people and fisher man need to keep their businesses running and is where people get a main source of food. Fishing is what keeps many people alive and keeps smaller fishing villages running, and without it, they cannot survive either. <span />
Answer:
The most likely explanation is that the star is a member of an eclipsing binary star system.
Explanation:
An eclipsing binary star system takes place when two stars which are close to each other move in an orbit in which sometimes, one star can hide the light behind the other.
There are two types of eclipses depending on the orientation of the orbit and the size of the stars: the totals or the annular ones. It may also be the case that the eclipses are partial.
<em>Algol </em>is the best known eclipsing binary star, and the first of this kind to be discovered. Its interval between eclipses is 173 hours (2.9 days).
When this type of eclipses happens, the brightest star provides 92% of the light of the system, while the eclipsed only contributes less than 8%, and there is a third star, which is not eclipsed.
Therefore, if there is any star that has been bright most of the time, and during certain time intervals it becomes dimmer, that star is being overshadowed.
I think its B but possibly C
This process is known as thermohaline circulation. In the Earth's polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink.
Inactive volcanoes are called dormant volcanoes. Mount (Mt.) Rainier is dormant, but may not be in the future.
