PEA Flashcards
What are the three groups of economic activities?
Primary, secondary and tertiary
What are primary activities and give an eg
Jobs that involve working directly with the earths rocks, soils and waters. Eg: farmer
What are secondary activities and give an eg
They are jobs that involve making something. Eg: baker
What are tertiary activities and give an eg
They are jobs that involve providing a useful service. Eg: teacher
What are the 4 stages of the water cycle
Evaporation, condensation, precipitation and run off
What happens during evaporation?
The sun heats up water in rivers, lakes, oceans and trees and turns it into water vapour
What happens during condensation?
The water vapour rises into the air and cools to form a cloud. Its then blown by wind towards land.
What happens during precipitation?
When there is too much condensed water in the air and it cannot hold it the clouds get heavy and the water falls back to earth in the form of hail, rain, dew, sleet or snow
What happens during run-off?
When the water falls down to earth it may fall into oceans, lakes, rivers or land. It will either be soaked in by soil or it may run-off into lakes, rivers or oceans and start the cycle again.
What chemicals do they add to water to make it clean?
An number of them including chlorine and fluoride
What is an example of a water supply
Limerick city from the river Shannon
What is irrigation?
The artificial watering of the land
What is an example of an irrigation scheme?
Central Valley California
What are the advantages to irrigation
The towns and cities have water and the area is irrigated in times of drought
What are the disadvantages of irrigation
Its very expensive and a lot of the water evaporates from the reservoir which leads to a high salt content
