Please help me out with these questions please..

Both are in 1 picture:)

In which environment would primary succession occur? a forest with a few remaining trees after a recent wildfire an area of exposed rock after a glacier melts away beach that is exposed to the air at low tide an abandoned baseball field in a small town

What material does not melt at any temperature

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: