to speak to other people and have them speak to you
interact
to move to another place
relocate
if something is not cooked enough
undercooked
to stay alive despite difficult conditions
survive
to protect something for the future
preserve
to work together to solve something
co-operate
to appear again
re-appear
when water destroys something
wash away
destroy something
devastate
to disappear forever
die out
poisoning and making something bad
contaminate
too crowded
overcrowded
to leave a place because of danger
evacuate
to affect a larger area or a bigger group of people
spread
if it lasts only for some time, not forever
semi-permanent