About 30 years ago my uncle bought a calculator for about $200. it could so simple mathematical calculations and had a limited memory. today. similar calculator costs under $5.why

I am going to say because the amount it costed to manufacture the calculator back then was so much more than it costs to manufacture one today. But if you are wondering why it cost so much to buy a graphing calculator that because they are rechargeable, they have much more memory and data space, even today graphic calculators can range from anywhere between $150 and $200 dollars, if you buy a nice one

Explanation:

I hope this answers your question

fabric is silk wool ext. paper isnt

explanation:

u cant make fabric out of paper cause paper comes from wood while fabric comes from animals

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.

hope it !