area, what would someone most expect to see in the shaded ring-like area? contacts volcano heights fault lines trench depths

How air particles exert a pressure on the inside of the balloon

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Suppose the universe were completely empty except for one object-a solid sphere moving through space of 100 km/s. what sort of path would the object be moving in? explain your answer