Claim-Evidence-Reasoning from Competition in Ecosystems snakehead fish

As adults, snakeheads can be voracious predators. Should snakeheads become established in North American ecosystems, their predatory behavior could also drastically disrupt food webs and ecological conditions, thus forever changing native aquatic systems by modifying the array of native species.

Explanation:

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.