Three hundred million years ago, ancient horsetails grew to tree size and made up much of what eventually became our coal deposits.
(ancient horsetails; grew; to tree size; T:Three hundred million years ago) (ancient horsetails; to tree; size) (ancient horsetails; made up; much of what eventually became our coal deposits; T:Three hundred million years ago)
ancient horsetails ancient horsetails ancient horsetails
grew to tree made up
to tree size T:Three hundred million years ago
size
much of what eventually became our coal deposits T:Three hundred million years ago