C. Habitat
Hope this helps.
Volcanoes can form underwater thats how Hawaii was made
Answer:The angular seperation is 
Explanation:
For two objects separated by a distance 's' and at a distance 'd' from the observer the angular separation ignoring the physical effects is given by

In the given question

light years
We know that in 1 light year there are 
Using the calculated values we get

Since π radians equals 180 degrees thus we have

Answer:
Nuclear testing is known to cause an abundance of environmental pollution. It also causes one to have intense skin burns and evolve acute radiation syndrome. In some cases even cancer and cardiovascular disease can develop, if exposed to nuclear radiation. These are a few of the reaons why countries try to limit their use of nuclear weapon testing. Keeping the people and environment healthy is their main concern.
(Hope this helped :)