The statement is correct.
The contour lines are a very good indicator of the relief. The closer they are to one another, the steeper the relief, and vice verse, the more distant they are from one another, the flatter the relief is.
In general, contour lines that are very close to each other can be noticed on the mountains, as most of the mountains have steep parts, or rather steeper slopes.
The more distant contour lines, on the other hand, can be found on places like the valleys or the plateaus, places that in general are much flatter.
There are three main reasons why people are concerned that cell phones (also known as “mobile” or “wireless” telephones) might have the potential to cause certain types of cancer or other health problems:
Cell phones emit radiofrequency energy (radio waves), a form of non-ionizing radiation, from their antennas. Tissues nearest to the antenna can absorb this energy.
The number of cell phone users has increased rapidly. As of December 2014, there were more than 327.5 million cell phone subscribers in the United States, according to the Cellular Telecommunications and Internet Association. This is a nearly threefold increase from the 110 million users in 2000. Globally, the number of subscriptions is estimated by the International Telecommunications Union to be 5 billion.
Over time, the number of cell phone calls per day, the length of each call, and the amount of time people use cell phones have increased. However, improvements in cell phone technology have resulted in devices that have lower power outputs than earlier models.
