The Earth's biosphere
A) consists of only terrestrial organisms, while the hydrosphere includes aquatic and marine organisms.
B) only includes the biotic components of an ecosystem, with the abiotic components being considered part of the lithosphere, hydrosphere, or atmosphere, respectively.
C) is more a theoretical construct than an observable sphere of study.
D) extends from the ocean floor to an altitude of approximately 8 km (5 mi) into the atmosphere.

Question

Quizplus · Accepted Answer

The Earth's biosphere extends from the ocean floor to an altitude of approximately 8 km (5 mi) into the atmosphere, encompassing both terrestrial and aquatic/marine organisms. Option A is incorrect as the hydrosphere also includes terrestrial bodies of water like lakes and rivers. Option B is incorrect since abiotic components such as air, water, and soil are part of the biosphere. Option C is incorrect as the biosphere is an observable sphere of study.

The Earth's Biosphere