Comprise of lithosphere

The lithosphere is the rigid, outermost shell on Earth. It is composed of the crust and the portion of the upper mantle that behaves elastically on time scales of thousands of years or greater. The outermost shell of a rocky planet, the crust, is defined on the basis of its chemistry and mineralogy.
The earth’s crust is not a homogeneous substance, it has different layers of rocks including sedimentary rocks on top, granitic and metamorphic rocks in the middle and basaltic rocks on the bottom.

The earth’s crust also consists of several large dynamic tectonic plates. These tectonic plates move slowly but continuously at an average rate of around 10 cm. Considering this, there was no Atlantic Ocean, and North America and Europe together were one continent 180 million years ago. The Atlantic Ocean came into being because of the drifting apart from the Eurasian and North America plates.