Because the sun and stars are emitting them constantly and we would be irradiated - i.e. life would not exist (at least not above ground - and/or as we know it)
By the earths atmosphere
The Sun through electromagnetic waves
The Sun through electromagnetic waves
body waves
body waves
earthquake waves travel through the earths crust.
Sound waves and electrmagnetic waves go through the atmosphere, to name two.
radio telescopes
The wave that can travel through earth and along earths surface is a SEISMIC wave.
Radio waves are the type of electromagnetic radiation that can pass through the atmosphere most easily. This is because they have the longest wavelengths and the lowest frequencies of all types of electromagnetic radiation. Radio waves can also pass through solid objects, which makes them useful for a variety of applications, such as broadcasting, communication, and remote sensing.
body waves
s-waves do not travel through Earth's mantle