describe about contour lines
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ᴄᴏɴᴛᴏᴜʀ ʟɪɴᴇ, ᴀ ʟɪɴᴇ ᴏɴ ᴀ ᴍᴀᴘ ʀᴇᴘʀᴇsᴇɴᴛɪɴɢ ᴀɴ ɪᴍᴀɢɪɴᴀʀʏ ʟɪɴᴇ ᴏɴ ᴛʜᴇ ʟᴀɴᴅ sᴜʀғᴀᴄᴇ, ᴀʟʟ ᴘᴏɪɴᴛs ᴏғ ᴡʜɪᴄʜ ᴀʀᴇ ᴀᴛ ᴛʜᴇ sᴀᴍᴇ ᴇʟᴇᴠᴀᴛɪᴏɴ ᴀʙᴏᴠᴇ ᴀ ᴅᴀᴛᴜᴍ ᴘʟᴀɴᴇ, ᴜsᴜᴀʟʟʏ ᴍᴇᴀɴ sᴇᴀ ʟᴇᴠᴇʟ. ... ɴᴜᴍʙᴇʀs ᴏɴ ᴛʜᴇ ʟɪɴᴇs ɢɪᴠᴇ ᴛʜᴇ ʜᴇɪɢʜᴛ ɪɴ ғᴇᴇᴛ. (sᴇᴀ ʟᴇᴠᴇʟ ɪs ᴢᴇʀᴏ.) ʟɪɴᴇs ᴅʀᴀᴡɴ ᴄʟᴏsᴇʟʏ ᴛᴏɢᴇᴛʜᴇʀ ɪɴᴅɪᴄᴀᴛᴇ ᴛʜᴀᴛ ᴀ sʟᴏᴘᴇ ɪs sᴛᴇᴇᴘ.
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