HM help!!! I HAVE 6 QUESTIONS!!! help!?

[kayzel_hernandez101]

1) how are stars held together?2 )what factors affect a wind's direction?3) what does the earth's atmosphere protect us from?4)which layer makes up a majority of the eath's volume?5) where are the Tropics of Cancer and Capricorn?6) what distinguishes one type of galaxy from another?THANK U FOR THE ANSWERS!

[loopy4960]

Stars are held together by their gravitationl pullCorrilus (sp) effect-is what effects the wind direction The earths atmosphere keeps most harmful rays Like Gamma rays/x rays/most uv rays out so that they do not harm us I can not remember the name of the layer, but its the one under the crusttropics of cancer and capricorn are on the equator cancer is above (double check that) and capricorn belowthere are three different types (i only remember spiral) Hope these help!!

[Freiddie]

Just to fill-in the other answer poster's gap:4) Mantle.5) 23.26 degrees latitude North and South6) Shapes, and types are spiral, elliptical, and irregular (the last one I'm not sure)

[Arasan1571]

(1)Stars are held together by the gravitational pull they exert on each other.In fact,galaxies are the collections of billions of such stars held together.(2)Pressure gradient force,coriolis force(increases with latitude affecting the wind direction),and to some extent frictional forces(below 2000 feet) due to tall buildings,small mountains etc. affect the wind direction.(3)The atmosphere filters out much of the sun's harmful ultra violet radiation and burns up objects(particularly meteors) approaching from space,preventing most of them from reaching earth.Significant amounts of oxygen in the atmosphere sustain most life on earth.Water vapour in the atmosphere is responsible for rainfall and other forms of precipitation,being one of the main sources of pure water.(4)The mantle is 2900 Km thick and makes more than 82 percent of earth's volume.it consists of molten rock called magma.(5) The tropic of cancer(23.5 degree latitude N) and the tropic of capricon(23.5 degree latitude S) are the limits of the apparent movement of the sun in the north-south direction.This apparent movement is caused due to the tilt of the earth's axis.(6)The galaxies are distinguised by their overall shape.Spiral galaxies have arms wound round a central nucleus.Barred spiral galaxies have arms spiralling round a bar-shaped core.Elliptical galaxies are oval in shape and have no arms.Irregular galaxies have no specific shape.