The Earth has never been endangered or harmed by a black hole, and chances are, never will be.
Black holes does emit radiation, but they cannot be detected from earth. We use gravitational lensing to "see" the black holes.
Earth is a planet. Center's of galaxies sometimes contain black holes. Planets can't be black holes.
Yes, that's where they are. A black hole on Earth would utterly destroy the Earth, in a very short time.The existence of black holes is now generally accepted, by the way.
No - at least no black holes as defined by physics.
Yes it is. They allow the harmful UV rays to pass through.
No. Earth was formed by the accretion of material in the protoplanetary disk around the newly formed sun. Black holes were not involved.
The thinning of ozone holes can cause harmful UV radiations to enter the surface of earth. These radiations are fatal to the living organisms on earth.
No
Black holes could be dangerous to people if people were close to a black hole, but there are no black holes near the planet Earth (as far as we know) and the closest one is probably in the center of the Milky Way galaxy, which is about 80,000 light years from Earth, which is a safe distance.
Black holes emit so very little radiation they are hard to see. Many black holes lie at the center of galaxies and there they are hidden by stars and dust.
They don't. They never have. They never will.
Black holes are outside the confines of both the Earth and the Solar System, the passing of our year does not affect when they form.