Which of the following lists the correct requirements for a black hole to form?

a. the star must be 10 to 28 times larger than earth’s sun, and a supernova explosion must not have occurred.

b. the star must be 29 times larger than earth’s sun, and a supernova explosion must not have occurred.

c. the star must be 10 to 28 times larger than earth’s sun, and a supernova explosion must have occurred.

d. the star must be 29 times larger than earth’s sun, and a supernova explosion must have occurred.

The correct requirement for a black hole to form is:

C. The star must be 10 to 28 times larger than Earth’s sun, and a supernova explosion must have occurred.

Explanation: The least star that is larger than the sun is 10 times larger and a supernova explosion would have happen before a black hole to form.

The star must be 10 to 28 times larger than Earth’s sun, and a supernova explosion must have occurred.

Option: (A)

answer(c) carved on a babylonian clay tablet that showed earth as a flat circular disk;

it is very hard for the climatologists to precisely predict how will the global temperatures be changing so there's lots of models, some of which differ significantly, this is due to multiple factors, and probably the most important is the human activity.

humans have been a key factor in climate change around the globe since the start of the industrial revolution, and in the past few decades the consequences are becoming more obvious. there's lots of emission of pollutants in the atmosphere as well as changing the environment on the surface itself, so it's really hard to predict how will that go in the future because there's some countries that are reducing the damage and are going towards green energy, while others are stubbornly continuing with pollution and damages to the environment.