how did the dinosaurs die?

65 or 66 million years ago a large asteroid smashed into Earth which eventually wiped out the dinosaurs, making it possible for our small mammal ancestors to evolve into many species. We are one of those species. If that asteroid had hit Jupiter (the solar system's vacuum cleaner) instead of Earth then we would not exist.

Since dinosaurs didn't go to church every Sunday, God had no choice but to strike them down. Obviously.

Asteroids

Chuck Norris sneezed.
Any more questions?

Old age.

A particularly hungry t-rex ate them all. Then he died of food poisoning. Ironic, isn't it?

by the flood

The Bible does not provide specific answers to this question. According to the Genesis account, animals were created during the fifth and sixth creative periods or ‘days.’

If the Hebrew expression translated “great sea monsters” includes dinosaurs, which often inhabited swampy, watery areas, this would mean that dinosaurs were created on the fifth “day.” Gen. 1:21

We do not know whether they continued to exist until man was created toward the close of the sixth “day”.

At the very latest it seems likely that they must have disappeared off the earth at the time of the flood of Noah’s day.

This is the "religion" section. How should we know?

ASKING THE SAME QUESTION TWICE LESS THAN TWO MINUTES APART IS PROOF THAT YOU ARE A MORON

most probably died from accidents, predators, or old age, just like all other animals. Dinosaurs became extinct, (except for modern birds), about 65 million years ago. Some of the likely reasons are an asteroid impact, volcanic activity causing climatic changes, or a combination of both.

meteor

God knocked the earth 30 miles out of orbit at Satan's rebellion.

Pretty much like this

https://www.youtube.com/watch?v=hTc9sLmOR0A

Brain death, usually.

the great global food

Since you are asking in the Religion & Spirituality section... the Bible does not comment on dinosaurs so there is no biblical answer to this question :)