'Dead vegetation built up in layers forms peat, which next forms this organic rock'
Coal
BEFORE THEY WERE ROCKS: Dead vegetation built up in layers forms peat, which next forms this organic rock
Dead vegetation built up in layers forms peat, which next forms this organic rock
Dead vegetation built up in layers forms peat, which next forms this organic rock
BEFORE THEY WERE ROCKS
Coal
BEFORE THEY WERE ROCKS