What the West's Ancient Droughts Say About Its Future

The article written by Lisa M. Krieger elaborates relating to lesson from california's ancient drought. Most of modern Californians facing frightening question toward the recent dry spell in California. Is the drought caused by an aberration or it could be a signal of mega drought that occurred several decades ago. Scientists have tendency to keep of the related question. According to several evidence that is measured in centuries, however, scientists agree that California is more vulnerable to drought. The most valid evidence is tree rings. The varying widths of the trees represent that a wide range of prejudicial dry spells gripped the west in the late 1500s. Other predominant study lead by Edward Schulman using tree rings in the 1940s found sustained period of low flow in Colorado river. Some scientist believe that megadrought returned in 21 century. Bill Patzert has identified the temperature of Pacific Ocean that contrive a ridge of high pressure over California to Alaska and freezing cold to the eastern United States. As a result, this phenomenon has significant ramifications such as more wildfires, wells go dry, field would go fallow, less water for agriculture, cities and wildlife.

news.nationalgeographic.com/news/2014/02/140214-drought-california-prehistory-science-climate-san-francisco-2/

The article is written by Lisa M. Krieger
Most of the modern Californians are facing the frightening question
Is the drought is caused by an aberration
Scientists have tendency to keep of the related question
dried wells go dry , fallow field would go fallow , lesslack of water for agriculture,

hallo iforsa.

Most of modern Californians facing a frightening question toward ...

the question is whether the drought caused by an aberration

or it could be a signal of mega drought that occurred several decades ago . sorry i can't understand what ...

Scientists have a tendency to keep of the related question.

Other predominant study studies lead by Edward Schulman using tree rings in the 1940s found a sustained period of low flow ...

i suggest you to pay attention to the article such a, an or the and also to the countable and uncountable noun.

Hi ifrosa..

i hope, it can be help you..........

- Californians facing frightening question toward the recent dry spell in California.

- IsThe drought caused by an aberration or ...

- The most valid evidence is tree rings. (i think you must give more information why tree rings is a most valid evidence).

- ... using tree rings in the 1940s found founded (use simple past) sustained period of ...

- Bill Patzert has identified the temperature of Pacific Ocean that contrive (this sentence is simple past)

thank you