Can someone answer these i am loaded with work and i go to school tomorrow i forgot i had this

What is thought to have caused the mass extinction at the end of the cretaceous period?

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

The table presents the average day and night temperatures in five cities. it also reveals whether a city receives substantial rainfall (wet climate) or little rainfall (dry climate). which city’s rocks are likeliest to experience frost wedging, and why? a) city a because the consistently subzero temperature would prevent water from melting b) city b because it is a wet region and the temperature fluctuates around the freezing point c) city c because it receives plenty of rain fall and the weather is moderately cool d) city d because the hot and dry weather would cause rocks to absorb water