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Solar energy reaches the earth by two means, Electricity and Gravity.
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Cloud covers, snow, and temperature
No, ice emits thermal radiation. It just emits less than so called room temperature. You need to get down to absolute zero, around -273C, to stop the emission of thermal radiation, which is caused by thermal activity.
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Not much. Some put the span of the IR spectra at a lightly different place than the thermal span, but the difference is marginal.
Infrared wavelengths fall just below visible red light in the spectrum. Short wave infrared, the frequencies closest to visible red, have no known effect, although some are suspected in the area of vision and effects on the thymus, a gland just behind the forehead. Long-wave infrared is known as heat. Most of us know the effects from having stood out in the sun. Too much heat, and you're toast. That pretty much covers it.
Electromagnetic radiation from the sun covers the entire spectrum including what we commonly call sunlight and X-rays. We often refer to the term sunlight to mean light in the visible spectrum, though it can be thought of as including infrared and ultraviolet light. Does sunlight contain X-rays? That depends on how you define sunlight.
Radiation physics is the scientific study of energy in radiology, which involves the interactions of ionizing radiation with matter and the principles behind the production, detection, and application of radiation in medical imaging. This field covers topics such as radiation dose, imaging techniques, radiation safety, and quality control in radiology.
Arthrology is the science of studying the joints. Arthrology covers the anatomy and functions of the joints as well as dysfunctions and diseases of the joints.
It depends on the strength of the active source. Alpha radiation is dangerous if it gets inside your body, gamma will penetrate your clothing and body if energetic enough, so it's difficult to give an answer that covers all cases. Health physicists have to consider each type of radiation on its merits.
I'll just quote "Fields and Waves in Modern Radio", by Ramo/Whinnery, 2nd edition, page 318: 1. TEM (transverse electromagnetic waves), 2. TM (transverse magnetic waves), 3. TE (transverse electric waves).