volcanic — made from hot melted rock that came out of the ground

endangered — at risk of disappearing forever if nothing is done to help

stick to — to follow rules or a plan without breaking them

step in — to get involved in a situation to stop a problem

stand up to — to be brave and refuse to be controlled by someone more powerful

die out — to stop existing completely, to become extinct

set up — to start or create something new

keep an eye on — to watch something or someone carefully and regularly

take over — to take control of something that belonged to someone else

sort out — to find a solution to a problem and fix it