Need Help pls i don't understand this question

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

What was the first instrument to ever record an earthquake?