Which of the following is correct about the earth's formation?
a. The surface of the earth, are what we call continents, was formed by the core of the earth's surface becoming solid and rising to the surface (just as islands like Hawaii are today)
b. The earth frgm very early on had water, most likely from a comet or other debris colliding with earth, and very soon it had big oceans
C. The continents have went through many changes in the history of the world because they are essentially plates formed from core of the earth, thus the continents have only collided many times in history but they are still moving today and will eventually collide again
d. All the above