There are 2 causes of meningits - viruses and bacteria. Bacterial meningitis tends to be much more dangerous. Viral meningitis is referred to as aseptic meningitis and tends to be more mild. Viral meningitis usually takes 3-7 days to incubate in a person after exposure. At that point they become contagious. They usually stop being contagious after 10 days. Most meningitis is spread through saliva and mucus from the nose.
Heat travels by conduction and radiation in solids and by convection in fluids like air and water. Radiant energy waves travel from the Sun through space and become heat energy when absorbed by a substance or materialâi.e., the Earth.
Most ofEarthâs heat energy comes from the Sun by the process ofradiation. Energy from the Sun enters Earthâs atmosphereand some gets trapped. This trapped energy warms theplanet. In this chapter you will learn that ocean currents,wind, and weather are all related to heat energy at Earthâssurface.