Concept:The earth's surface is made up of distinct physical spheres, and this question tests your ability to identify the sphere that consists entirely of liquid water.
Explanation:The earth is composed of four major spheres.
The lithosphere represents the solid, rocky outer layer of the earth.
The atmosphere is the gaseous envelope surrounding the earth.
The biosphere is the zone where living organisms exist, interacting with air, water, and land.
The hydrosphere, however, is the component that includes all liquid water found on the earth's surface.
This includes oceans, seas, lakes, rivers, and underground water.
Since the question specifically asks for the liquid portion of the earth's crust, the hydrosphere is the accurate term.
Answer:B. hydrosphere