Answer:
Statement that is true about electromagnetic and mechanical waves is:
Option B: Mechanical waves must travel through a medium, but electromagnetic waves do not require a medium to travel.
Explanation:
'Electromagnetic' waves do not need any medium to travel whereas 'mechanical waves' need a medium or matter for transmission. Electromagnetic waves are produced by the 'vibrations' of the charged particles. They can even travel in vacuum.
On the contrary, mechanical waves are caused by the 'wave amplitude'. Mechanical wave can travel in solid, liquid and gas and are considered to be periodic disturbance.
Thus, Option B is the most statement apt explaining the difference between electromagnetic and mechanical waves.
Answer:
According to John Kingdon, it takes basically three steps: the problem; the solution; political will. If you show a problem without it's solution, it will not get the necessary attention and nothing will happen. Political will is very important too, and it can come from many factors, like post-elections views and natural disasters. These three fluxes have to encounter in order to get enough attention and make an available solution to fix the problem. This is called a policy window and it is highly important for the agenda setting on politics issues in a country.
Lets put the fires in Amazon forest as the environmental issue. It is caused by livestock producers, specially cows, that burn the threes to make more free lands to put their animals. With the conservative government that works in partnership it is not interesting to save the amazon forest. It is the opposition and the people's job to raise awareness about the situation and propose solutions. The political will can come by people's interest, and in this case, by the influence of others countries opinions over the subjects, like France.
Answer:
Torwards the end of Canada
Explanation:
Many people in Canada barter to trade goods for less fortunate places so look it up
Portuguese sugar plantations on African island colony Madeira provided largest market
Introduction of sugarcane to the Americas causes slaves to move to South and Central America