1.   The algae consumed waste products from the reef and under the intense artificial sunlight they proliferated in stringy green mats.

2.   If there is excessive growth of algae in lakes and rivers it can create an almost solid green mat across the surface of the water.

3.   These, the other green mats.

4.   In the Gaza Strip, several dozen Palestinians barred from entering Israel knelt in prayer on green plastic mats along a roadside at the southern end of the strip.