How are supernovae involved in new planet formation? They are the death of massive stars. They provide matter and energy that fuel new planet formation. They are not involved in new planet formation. They consume all the nearby nuclear fuel and allow new planets to form.

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.

Asmall, positively charged ball is moved close to a large, positively charged ball. which describes how the small ball likely responds when it is released? it will move toward the large ball because like charges repel. it will move toward the large ball because like charges attract. it will move away from the large ball because like charges repel. it will move away from the large ball because like charges attract.

If element x has 99 protons how many electrons does it have