The Tunguska event refers to a meteor impact on June 30, 1908. On that day, a meteor entered the Earth's atmosphere, burned up, and exploded in the air above the Tunguska River valley in Russia. It knocked down trees over thousands of square kilometers and started a forest fire, but produced no crater, and apparently caused no human casualties. A witness sitting on his doorstep outside the zone of falling trees recalled events in the following sequence. He saw a bright light moving in the sky, descending towards Earth at a low angle to the horizon. Suddenly, he felt his face become warm. Then, he felt the ground shake. Next, an invisible force threw him about a meter away from where he was seated. Finally, he heard a very loud rumbling sound. What types of waves are involved in each of these observations? Explain why these events happened in the order described.

The Tunguska event refers to a meteor impact on June 30, 1908. On that day, a meteor entered the Earth's atmosphere, burned up, and exploded in the air above the Tunguska River valley in Russia. It knocked down trees over thousands of square kilometers and started a forest fire, but produced no crater, and apparently caused no human casualties. A witness sitting on his doorstep outside the zone of falling trees recalled events in the following sequence. He saw a bright light moving in the sky, descending towards Earth at a low angle to the horizon. Suddenly, he felt his face become warm. Then, he felt the ground shake. Next, an invisible force threw him about a meter away from where he was seated. Finally, he heard a very loud rumbling sound. What types of waves are involved in each of these observations? Explain why these events happened in the order described.