Answer: In Medieval Europe, knights pledged loyalty to vassals, who in turn pledged theirs to powerful lords, and serfs labored in the fields.
Explanation:
A rigid hierarchy refers to one where people who are born into a certain position in life, find it quite hard to move from it or rather one where there are different social classes and people had to be classified in one class for the system to work.
The system during medieval times was much like this. Social classes existed that determined a person's worth in society such as the knights, vassals, Lords and Royals. There was also the serfs who were considered the lowest in the hierarchy.
Answer:
climate is affecting earth becuase of global warming. Global warming is causing sea levels to rise.
Explanation:
There is a close relationship between evaporation( transformation of water into water vapor in presence of heat), condensation (transformation of water vapor into water droplets), condensation nuclei (minute water droplet) and cloud (assemblage of too many water droplets). For the formation of cloud all these mentioned conditions are required.
Explanation:
Evaporation refers to the transformation of water into water vapor by the action of heat, condensation means transformation of water vapor into water droplet in normal temperature, condensation nuclei refers to the water droplets which is base of formation of cloud.
Cloud forms from the assemblage of water droplets. These water droplets are formed in saturated air condition when the air is full of humidity. Relative humidity means the ratio between the water holding capacity of air and the amount of actual water in air at that particular temperature.
Answer:
Explanation:
Solar Irradiance: Solar irradiance is the total heat energy received from sun per unit time and per unit area. Its unit is watts per square meter.
Solar irradiation: Both solar irradiation and solar isolation are a measure of time integrated solar energy. The solar energy received per unit area over a fixed time period( hour, day, month, year, ect.) is called solar irradiation or solar isolation.
Peak Sun hours: Peak sun hours are those hours of the day when we receive maximum magnitude of solar irradiation or isolation. Amount of irradiation keeps changing with seasons, altitude, etc.
