Questions of reliefs

Definition of relief:

Relief: are variations in Earth's crust: the variations in height of a land surface and its being shaped into hills and valleys, or trenches and cliffs.

What is the difference between an underwater relief and a continental relief?
Underwater relief is mainly under the seas and oceans as the name says, and continental relief is every landform or anomaly that are in the continent or that you can see land, even if it's below sea level but it's not underwater.

Task 1: What is the relief of Ecuador?

Look here for a physical Ecuador's map
Task 2: What is the relief of Quito?
It was very hard to find I put some links to physical pictures of Quito in Pichincha because I didn't find a more exact picture.

Physical Pichincha; Another Pichincha map

What deep is the lowest point of earth? How far is it to the highest point?
The Mariana Trench, which is the deepest point on Earth's crust is 11 km below sea level. The highest point on Earth's crust is the Everest which is 8,85 km above sea level.

The Mariana Trench is 19,85 km away from the top of the Everest.

Do you think the earth's relief has always been the same?

No, I don't think so because first of all all the continents were together in the mega continent called Pangea, and later it moved so the movements of the plates and the internal and external energy, with the erosive agents, and different types of changes have modeled the Earth's crust as it is today; and they continue changing it everyday.