THE 1908 SIBERIAN EXPLOSION Not much is known about the Tunguska explosion and many scientists have different opinions and theories about what could have caused such mass destruction. Pictures or painting of the event are unavailable because of the isolated area and early date of this occurrence...

3. A Desert plants have evolved ways of conserving and efficiently using the water available to them. Some flowering desert plants are ephemeral; they live for a few days at most. Their seeds lie dormant in the soil, sometimes for years, until a soaking rain enables them to germinate and ...