The innovation that enabled the Maya to adapt to their tropical environment and build a great civilization was the construction of raised fields along rivers. These raised fields, also known as "chinampas," were created by digging canals to divert water from rivers or lakes to surrounding areas. The displaced soil from the canals was then piled up to form raised beds, creating perfectly irrigated and fertile farmland. This agricultural technique allowed the Maya to cultivate crops, especially maize, in the nutrient-rich soil of the lowlands. The construction of raised fields helped the Maya overcome challenges such as water management, poor soil quality, and flooding, which were common in their tropical environment. Therefore, this innovation played a crucial role in the Maya's ability to adapt and sustain their civilization.