DiggingforTruth

At this time immense forests were buried. These have since been changed to coal, forming the extensive coal beds that now exist, and also yielding large quantities of oil. The coal and oil frequently ignite and burn beneath the surface of the earth. Thus rocks are heated, limestone is burned, and iron ore melted. The action of the water upon the lime adds fury to the intense heat, and causes earthquakes, volcanoes, and fiery issues. As the fire and water come in contact with ledges of rock and ore, there are heavy explosions underground, which sound like muffled thunder. The air is hot and suffocating. Volcanic eruptions follow; and these often failing to give sufficient vent to the heated elements, the earth itself is convulsed, the ground heaves and swells like the waves of the sea, great fissures appear, and sometimes cities, villages, and burning mountains are swallowed up. These wonderful manifestations will be more and more frequent and terrible just before the second coming of Christ and the end of the world, as signs of its speedy destruction.  Patriarchs and Prophets, page 108.2

Before the flood there were immense forests. The trees were many times larger than any trees which we now see. They were of great durability. They would know nothing of decay for hundreds of years. At the time of the flood, these forests were torn up or broken down and buried in the earth. In some places large quantities of these immense trees were thrown together and covered with stones and earth by the commotions of the flood. They have since petrified and become coal, which accounts for the large coal beds which are now found. This coal has produced oil. God causes large quantities of coal and oil to ignite and burn. Rocks are intensely heated, limestone is burned, and iron ore melted. Water and fire under the surface of the earth meet. The action of water upon the limestone adds fury to the intense heat, and causes earthquakes, volcanoes, and fiery issues. The action of fire and water upon the ledges of rocks and ore causes loud explosions which sound like muffled thunder. These wonderful exhibitions will be more numerous and terrible just before the second coming of Christ and the end of the world, as signs of its speedy destruction.  {1SP 81.3}