In the great plains of the u. s., tornadoes are common in the summer. this is because

Here is the complete sentence: In the great plains of the U.S., tornadoes are common in the summer. This is because, WINDS PICK UP SPEED MORE GRADUALLY IN THE SUMMER.

The Great plain of US refers to the broad expanse of land that lies to the west of Mississippi River and east of the mountains of US and Canada. The region transverses more that nine states in the US and cover portions of two countries.The major part of the land can be described as grassland. The region has a continental climate and is always hot in the summer; during this period tornadoes is common in the area as a result of storms that are characteristic of the period.  

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

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