Well first off they are commonly used for special needs. "<span>What appears as simple as a button, the proper switch will open up worlds of access to communication devices, environmental controls, computer software and mobile devices".</span>
Refrence:https://www.especialneeds.com/shop/assistive-technology/switches.html
They were made of sun-dried mud bricks in ancient Sumeria.
Answer: official beginning of the Economic Recovery Program
Explanation: This speech marked the official beginning of the Economic Recovery Program (ERP), better known as “The Marshall Plan.” Under the plan, the United States provided aid to prevent starvation in the major war areas, repair the devastation of those areas as quickly as possible, and begin economic reconstruction.
Answer: True
Explanation:
In a coal-fixed power station, coal is burnt to heat up water which then turns into steam. This steam is then channelled to turbines that are connected to generators. When the steam makes the turbine turn, electricity is produced by the generators.
These are the main type of plants used in the developing world to create electricity however they cause a lot of pollution, particularly of air.
