Sound can be both longitudinal waves and transverse waves.
<span>The earth’s revolution is the movement of earth around the sun. the term rotation describes the earth’s movement on its own axis.
Its b.revolution,rotation.</span>
Strict building codes and school drills were implemented in Chile after the 1960 earthquake that was the largest ever recorded on the planet.
There are many people in urban areas. If there are floods, it could kill a lot of people. Also, floods sometimes damage buildings. If the buildings collapse, it would cause a big problem.
Contacts between sedentary and nomad peoples<span> resulted in trade, tribute payments</span>
