In this novel professor travels roughly 30 million years ahead of his own time. There he notices a lot of changes in the Earth. What were these changes and what were there possible causes? name all 4 of them.

The Time Traveller saw many changes in the earth including; the last living things on earth were dying, the beaches were red like blood, the earth's rotation is slowing and eventually stop, the sun grows ever larger and redder and eventually moves the other way dimming completely, after which the earth freezes and all living things die.

As for the causes, check out Grradesaver's themes linked below, you will find a detailed look at what the causes are seen to be.

http://www.gradesaver.com/the-time-machine/study-guide/major-themes/