Tornadoes form when warm, humid air collides with cold, dry air. The denser cold air is pushed over the warm air, usually producing thunderstorms. The warm air rises through the colder air, causing an updraft. The updraft will begin to rotate if winds vary sharply in speed or direction1
Answer:
A stream in a bedrock valley located 5000 feet above ultimate base level that is draining a mountainous region in the headwater of a stream system would have a _____.
high gradient, and a narrow and shallow channel with no floodplain
Explanation:
A bedrock valley has no alluvium mantling the bedrock over which it flows. Alluvium (consists of sand, gravel, silt, clay, and gravel, as well as other organic matters) mantlings or coverings are usually developed in the lower part of the river with the formation of floodplains and deltas. They may also be deposited at lakes or river banks. Headwater streams deliver nutrients and other organic materials (e.g. fallen leaves) to downstream regions to sustain downstream aquatic life.
Answer:
d. It involves the use of expert judgment to develop forecasts.
Explanation:
Forecasting :
Forecasting is the prediction technique of future demand by using past data.
The type of forecasting:
1 .Qualitative
In this technique ,expert gives own opinion regarding the future demand of any service or product.
2. Quantitative
In this technique
1 . The information can be quantified
2.Assume that future demand will follow a past demand curve.
3.. It can be used when past information about the variable being
forecast is available.
In the quantitative forecasting pert judgment does not use to develop forecasts.
Option d is the correct answer.
d. It involves the use of expert judgment to develop forecasts.
Answer:
In the Middle Ages, spices that are now ordinary were rare imports from faraway places.
Explanation:
The central idea of the text can be defined by the excerpt above.
The text is explaining the process that Italian merchants had to go through in order to carry a expensive spice (pepper) from Syria to the fairs of Champagne, in France.
This is because spices were a very well-regarded and expensive product that could only be afforded by the wealthy at the time, since shipping methods at the time were primitive (slow ships, camels), raising the cost of these products to levels that would be hard to imagine today.
