A straw bale barrier lining the perimeter of a home construction site protects against erosion.
<u>Explanation:</u>
A straw bale barrier functions similar to a filter. It is porous only enough to let the water pass but the pores aren't big enough to let other particulate matter pass through it.
When the water washes off the material that forms the surface layer of an area, erosion is said to have occurred.
This particulate material is stopped by the straw bale barrier from flowing off and hence the site is protected against erosion.
They are electromagnetic waves because mechanical waves have to be physically created by something, while electromagnetic waves are just emitted without any effort or force.
Well to find this out you need to make an equation
s+7=j So for example if Johnny's sister is 15 then Johnny would be 22 because s(sister's age) +7(number of years difference between their ages)=22(Johnny's age)
