Mark 13 study questions

What are the "things about to be accomplished"? (v 4)

How does the abomination of desolation connect to prophecies in Daniel 9 and 11. Has this been fulfilled, is it yet to be fulfilled or is there a double fulfilment? (v 14)

What Old Testament prophecies are being linked to in verses 24 to 27? 

What does Jesus mean by saying that heaven and earth will pass away? (v 31)

What are disciples of Jesus to do to ensure they are on their guard and awake? (v 32 to 37)