Hadean time (4.6 to 4 billion years ago)* is not a geological period as such. No rocks on the Earth are this old, except for meteorites. During Hadean time, the Solar System was forming, probably within a large cloud of gas and dust around the sun, called an accretion disc.
Answer: So far scientists have not found a way to determine the exact age of the Earth directly from Earth rocks because Earth's oldest rocks have been recycled and destroyed by the process of plate tectonics......
To show that HIV is spreading throughout the population.
And to encourage the public to support the fight against HIV.
Explanation:
Human Immune deficiency virus (HIV), is very dangerous to the overall body system and more over defense lines of the human body. As, it makes the body more vulnerable to other diseases and disorders and the body is no more able to protect itself from the various pathogens.
However, there should be campaigns carried out for the purpose of awareness among the masses and tell the people how to protect themselves and others from such chronic disorders.
