How is the world going to end according to Islam al- Quran?

The signs of the final hour can be divided
into two groups.
1) Minor signs
Minor signs are events of normal nature
prophesised by our Prophet Muhammed (pbuh) to
take place before Qiyamah like the
consumption of alcohol, lifting of
knowledge and prevalence of ignorance
and immorality and signs of this nature.
The majority of the minor signs have
appeared while some are occurring and
some will appear with major signs.
2) Major signs
Major signs ae events of extraordinary
nature prophesied by our Prophet to take
place before Qiyamah like all the events
mentioned in the following hadith
narrated by Hudhaifa ibn Usayd that the
Prophet said, 'The last hour will not
arrive till you have seen ten signs. He
then mentioned the Smoke, Dajjal, Beast,
Rising of the Sun from the place of it's
setting, the Descent of Isa, Ya'juj Ma'juj,
Three Landslides, one in the East , one in
the West and one in the Arabian
Peninsula after that a Fire would spread
from Yemen and drive the people to their
place of gathering.' (Muslim)
The Signs of Imaam Mahdi
1) He will be from the progeny of the
Prophet and descendent of Fatimah (R.A).
Umme Salama (R.A) reported: I heard the
Prophet of Allah () saying, "The Mahdi
will appear from my progeny, from the
descendants of Fatimah." (Abu Daud)
2) His name will be Muhammad or Ahmad
and his father's name will be Abdullah.
Ibne Masood (R.A) reported that the
Prophet said, "If there remains in the
world but a day, the mighty Allah will
greatly prolong that day till he will send
there in a man from me or from the
members of my house. His name will be
similar to my name and his father's name
to my father's name." (Abu Daud)
3) He will resemble the Prophet in
character. Hadrat Ali (R.A) once looked at
his son and remarked, "This son of mine
is Saiyid who was named by the Prophet
and soon from his loins will come forth a
man by the name of your Prophet and
who will resemble him in conduct but not
in appearance." (Abu Daud)
4) He will have a shiny forehead and a
high bridge nose. Abu Saeed reported that
the Prophet said, "The Mahdi will appear
from me, shining of forehead, long of
nose." (Abu Daud).
5) Once Hadrat Ali (R.A) was asked
regarding his description. He replied, "He
is a well built youth of average height and
a handsome face, his hair reaches his
shoulders and the light of his face is
contrasted by the darkness of his hair and
beard." (Al-Isha'ah)
6) He will be slow of speech (a slight
stutter) and when he is delayed, he will
strike his left thigh with his right
hand." (Al-Isha'ah)
7) He will appear from the east. Thawban
(R.A) reported that the Prophet said,
"Three men will be killed at the place
where your treasure is. Each of them will
be the son of a Khalifah but none of them
will get hold of the treasure. Then the
black banners will come out of the east,
and they will slaughter you in a way that
has never been seen before. If you see
him give him your allegiance, even if you
have to crawl over ice, because he is the
Khalifah of Allah, the Mahdi." (Ibne
Majah)
Only some of the signs that will precede
Imaam Mahdi and of the Mahdi himself
have been gathered in this book. The true
Mahdi, the one referred to in the Ahadith
of Prophet as one of the signs of Qiyamah,
is the one in whom the pre-mentioned
signs are found.
Signs in the Dajjal
Dajjal's Physical description
The Dajjal is a young1 fat 2 man,
wheatish3 in complexion with a broad
chest 4 and biting teeth. Resembling
Abdul Uzzah bin Qatad from the tribe of
Khuza'a his head is covered7 with curly
hair8 with the letters "Ka' "Fa" "Ra''9
written between his eyes which every
believer will be able to clearly see and
read literate or illiterate, he has a shining
forehead10 and defect in both eyes. His
left eye has a swelling pupil11 while he is
blind12 from the right. He has a brisk
walk13and no children14
Dajjal's Emergence
Conquering Constantinople with Takbir,
the Muslims will begin
By war4u