1. Define atmosphere. List any three ways in which the atmosphere is useful for survival of living things ?
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The atmosphere blocks out harmful rays from the sun. The ozone layer, which lies in the stratosphere 11 to 50 kilometers from the Earth's surface, blocks out many harmful forms of radiation. Without the ozone layer, ultraviolet rays would destroy most life on Earth. Gases in the atmosphere also hold in heat.
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ᴛʜᴇ ᴀᴛᴍᴏꜱᴘʜᴇʀᴇ ʙʟᴏᴄᴋꜱ ᴏᴜᴛ ʜᴀʀᴍꜰᴜʟ ʀᴀʏꜱ ꜰʀᴏᴍ ᴛʜᴇ ꜱᴜɴ. ᴛʜᴇ ᴏᴢᴏɴᴇ ʟᴀʏᴇʀ, ᴡʜɪᴄʜ ʟɪᴇꜱ ɪɴ ᴛʜᴇ ꜱᴛʀᴀᴛᴏꜱᴘʜᴇʀᴇ 11 ᴛᴏ 50 ᴋɪʟᴏᴍᴇᴛᴇʀꜱ ꜰʀᴏᴍ ᴛʜᴇ ᴇᴀʀᴛʜ'ꜱ ꜱᴜʀꜰᴀᴄᴇ, ʙʟᴏᴄᴋꜱ ᴏᴜᴛ ᴍᴀɴʏ ʜᴀʀᴍꜰᴜʟ ꜰᴏʀᴍꜱ ᴏꜰ ʀᴀᴅɪᴀᴛɪᴏɴ. ᴡɪᴛʜᴏᴜᴛ ᴛʜᴇ ᴏᴢᴏɴᴇ ʟᴀʏᴇʀ, ᴜʟᴛʀᴀᴠɪᴏʟᴇᴛ ʀᴀʏꜱ ᴡᴏᴜʟᴅ ᴅᴇꜱᴛʀᴏʏ ᴍᴏꜱᴛ ʟɪꜰᴇ ᴏɴ ᴇᴀʀᴛʜ. ɢᴀꜱᴇꜱ ɪɴ ᴛʜᴇ ᴀᴛᴍᴏꜱᴘʜᴇʀᴇ ᴀʟꜱᴏ ʜᴏʟᴅ ɪɴ ʜᴇᴀᴛ.
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