Yes, it should be. If the sidewalk is not higher than the lawn water will collect on top of the sidewalk when it rains. If the temperature drops below freezing the sidewalk could crack.
It depends on the size of the sections, but generally, no less than 4 inches.
Yes. I guess it depends on which sidewalk you're talking about.
It depends on the situation. From life saving to just lawn mowing. When life threatening first attend to yourself than other, while lawn mowing if you remind your neighbor too much about his lawn. He might just be annoyed.
Because the water from inside of the plant's cell diffuse to the outside of the plant. It happens because the concentration inside of the cells is higher than the salting from the sidewalk, so the cell become shrink trying to even the concentration. Most plants will die during this process.
It should be hung higher than the primary infusion bag.
The sidewalk, because the texture is more "rough" than that of the gym floor.
Chemical and Organic fertilizers should be applied more than once a year. It should be at least 3 or 4 times a year.
There's less friction over a smooth concrete sidewalk
Is it Inertia
Frictional force. On a rainy day, the property of the sidewalk changes the coefficient of friction, causing you more likely to fall.
If your lawn is more than half an acre-than you might want to consider a riding lawnmower
from a distance away why does a jet sound loader than a lawn mower