Hints: scorpion swampy vertebrate amphibian Carboniferous tectonic monsoon vegetation

And these were preyed on by other giants like scorpions. Some were over 70 centimeters long with a sting to match. These swampy forests were also roamed by the very first land vertebrates: amphibians.
The Carboniferous era was to play a pivotal role in European history. Its 300 million-year-old legacy would eventually revolutionize a modern world. This was the time of great tectonic activity. As the land repeatedly subsided, seas flooded over these great coastal forests. Ravaged by monsoon storms, fallen trees became buried by layers of sand, then mud. Over millions of years, the buildup of sediments compressed this vegetation into this: coal.

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