The oldest,
The deepest,
The highest

Methuselah is the ************ of tree, which is the oldest living thing in the world. Scientists have calculated that it is 4700 years old. It is a pine tree and it is found in the white mountains of California at ****************** of over 3000m. So we can see that this tree began to grow at about the same time as the building of the greet Pyramid in Egypt.

The deepest place in the ocean is called challenger deep. It got its ************ from the British survey chip, challenger 2,
This pinpointed the deepest water on the earth in 1951.
These were in the Pacific Ocean, and 1960, the US navy sent down a mini-submarine, called a bathyscape, it touched bottom nearly 11 Km below the surface.

Everest is the highest mountain in the world. It is 8850m above sea level. It was first claimed in May 1953 by a New Zealander, Sir Edmund Hillary, and a Nepalese, Tenzing Norgay, when Hillary and Norgay climed to the top, they wore oxygen tanks. The top of the mountain is in the upper area of the earth's atmosphere where there is not much oxygen, and it is extremely difficult to breathe, since Hillary and Norgays expedition, many climbers have climbed the mountain without any extra oxygen, but they must take one step every five minutes.