Compare and contrast the wind-chill factor and the heat index. ...

[michelleunicorn]

Compare and contrast the wind-chill factor and the heat index.
 
  What will be an ideal response?

Question 2

Entrenchment of a channel occurs because
 
  A) a decrease in stream gradient occurs.
  B) a change in the bed load size-distribution occurs.
  C) the river flows from consolidated rock into a region composed of loose sediments.
  D) rejuvenation occurs due to uplift.
  E) isostatic downwarping of the crust occurs.

[sokh]

Answer to Question 1

The wind chill factor quantifies the enhanced rate at which body heat is lost to the air. On cold, windy days, increased wind speeds can increase heat loss from the skin. The result is an apparent temperature cooler than the actual air temperature. The National Weather Service (NWS) uses a wind-chill temperature index to plot the wind chill factor, using actual air temperature and windspeed as the factors. Similarly, the NWS reports a heat index which uses temperature and relative humidity as factors to indicate likelihood of heat disorders. When humidity is low and windspeed is high on high temperature days, evaporative cooling help keep body temperature within appropriate range. However, on hot days with high humidity, coupled with low wind speeds, evaporative cooling is diminished and the risk of heat stress rises.

Answer to Question 2

D