The black holes found in space? No. An underwater volcano or a split in the seafloor can leak magma into the ocean causing it to instantly cool. This is one way islands are formed. So the volcanic stone may be black, but they are not referred to as black holes.
the period time of volcanoes need to go out from the holes and the things that make it faster to happened
Black holes (in the astronomical sense) have never been made in the laboratory.
no black holes are stars
well you wouldn't need any to make a black holes to make binary systems but what do make binary systems are two stars.
They do the opposite, they stretch you.
No, black holes do not make sound in space because sound requires a medium to travel through, and space is a vacuum with no medium for sound waves to propagate.
They don't. They never have. They never will.
black and hole are two ask some one else for others
One of the LHC's objectives is to create micro black holes. These holes are so small however, they evaporate into radiation almost immediately.
it will make holes
Yes and no. It is rather hard to explain, because black holes are so dark and black that no living creature can see them, which in a sense makes them invisible, but you can also see where a black hole is because it sucks in light, too, so that would also, in a sense make it visible, but the my main answer would be, no black holes are not invisible.
Black tips on foliage may suggest the plant is suffering from soluable salt build up in the soil. Each time you water, make sure you water enough, so you can actually see water draining from the holes in the bottom of the pot. This is referred to as "leaching".