What do scientists study to reconstruct past climate conditions? a. tree branches, pollen grains, and rain b. water pollen grains, tree rings, and fossils c. rain water, tree rings, and fossils d. fossils, pollen grains, and tree branches

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.