Each day, changes take place in the atmosphere. all these frequent changes are called a. rain b. wind c. weather d. climate

The right option is; C. Weather  

Each day, changes take place in the atmosphere. All these frequent changes are called weather.

Weather is the short term state or momentary conditions of the atmosphere at a specific time and place. Weather occurs frequently i.e continuously at short intervals such as from day to day or from week to week. Atmospheric features of weather include temperature, wind speed and direction, humidity, cloud cover, and precipitation.  

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.