Phytoplankton Definition: Tiny, microscopic powerhouses of photosynthesis found in oceans and lakes; they’re the primary producers in aquatic food webs! Example: Diatoms, a type of phytoplankton, play a crucial role in generating oxygen and forming the base of the marine food chain. Without them, many ocean creatures would go hungry! Plate Subduction Definition: This is the dramatic process where one tectonic plate dives under another and sinks into the mantle. Example: The Pacific Plate is...