Earth does not receive a steady supply of matter from space.
Therefore, what is cycled over and
over through an ecosystem?
A. producers
B. nutrients
C. energy

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The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.