Final answer:
The rocky surface that covers both land and the bottom of our oceans is called the crust.
Step-by-step explanation:
The rocky surface of the Earth that covers both the land and the bottom of our oceans is called the crust. There are two types of crust: the oceanic crust, which covers 55% of Earth's surface and lies mostly submerged under the oceans, and the continental crust, which covers 45% of the surface and is found beneath both land and the oceans. The oceanic crust is made of volcanic rocks called basalt, while the continental crust is predominantly composed of silicates called granite.