1) A classic example of an interaction between spheres is when a plant (part of the biosphere), takes carbon dioxide from the atmosphere and water (the hydrosphere) through its roots from underground (geosphere) to perform photosynthesis, which provides the plant with food and releases oxygen into the atmosphere.
2) When volcanoes (lithosphere) erupt. Dust and ash particles (lithosphere) spread through much of the atmosphere and block sunlight. Less sunshine can cause a cooler, drier climate in parts of the world. Cooler climate affects the biosphere by shortening the growing season.
