Question

what are the continents considered to be a part of?
the hydrosphere
the core
the asthenosphere
the lithosphere

Explanation:

The lithosphere is the rigid outer layer of Earth, which includes the continental and oceanic crusts, plus the uppermost mantle. The hydrosphere is all Earth's water, the core is Earth's central metallic layer, and the asthenosphere is the ductile upper mantle layer below the lithosphere. Continents are part of the crust component of the lithosphere.

Answer:

the lithosphere