Chapter 2: Physical Environment – Dive into the Earth’s Wonders! Key Terms, Definitions, and Examples Calcareous Definition: Think of it as anything that contains calcium carbonate, a key building block for many marine organisms and sediments. Example: Calcareous algae are nature’s little architects, helping to build coral reefs by creating a solid structure that supports diverse marine life. These algae are essential players in ocean ecosystems! Climate Definition: The big picture average of...