The breaking down and changing of rocks at or near Earth's surface is called. Weathering.
D. Ice has the power to sculpt the landscape.
If a boater sounds five short blasts on a horn, it represents danger, or that the boater does not understand the approaching boat's intentions.
If the boater sees another boat approaching him, and he suspects that something fishy is going on, or he doesn't understand what the other boat is trying to do, he will sound five short blasts on his horn, in order to show that something is wrong.
These phrases, which refer to the radio wavelength employed, are used in radio communications. There is no actual formal definition of longwave, however they are low frequency radio waves that are often below 540 kHz.
These low frequency radio waves travel across the earth via ground waves and may be picked up practically everywhere. On the other hand, shortwave radios encompass the spectrum from long or medium wave up to microwave frequencies and are higher frequency (hence shorter wavelength). Medium frequencies (HF) are a combination of ground and sky wave and may be received at medium to long ranges. Higher frequencies (VHF and UHF) are mostly short range sky wave propagation.
