Questions 1-3 are about the following passage.

The highest mountain in the world is thought to be Mount Everest, but, in fact, the Mauna Kea stands taller than all other mountains in the world. Although Mount Everest is over29,000 feet above sea level, the Mauna Kea volcano is over 33,000 feet tall. Most people do not know Mauna Kea is taller because the base of the volcano begins under the sea. In contrast, Mount Everest's base is completely above the ocean.

There has been confusion about why Mount Everest holds the crown as the highest mountain in the world when Mauna Kea is roughly 4,000 feet taller. This is because of the difference between mountain height and tallness. Height is how far a mountain reaches into the sky. While the tallness of a mountain is measured from the base to the peak, the height is measured from sea level to the peak. Because Mount Everest is 29,000 feet above the sea, it is higher than Mauna Kea. However, Mauna Kea is taller because a large part of the mountain is under water. If both mountains started at sea level, Mauna Kea would be the loftier of the two.