when it is said that rivers are slow on the basis of slope ?
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ᴀ ʀɪᴠᴇʀ's sʟᴏᴘᴇ ɪs ᴜsᴜᴀʟʟʏ ᴇxᴘʀᴇssᴇᴅ ɪɴ ғᴇᴇᴛ ᴏғ ᴠᴇʀᴛɪᴄᴀʟ ᴅʀᴏᴘ ᴘᴇʀ ᴍɪʟᴇ ᴏғ ʟᴏɴɢɪᴛᴜᴅɪɴᴀʟ ʀᴇᴀᴄʜ. ᴛʜᴇ ᴄʜᴀɴɢɪɴɢ ɢʀᴀᴅɪᴇɴᴛ ᴘʟᴏᴛᴛᴇᴅ ᴏᴠᴇʀ ᴛʜᴇ ʀɪᴠᴇʀ's ʟᴇɴɢᴛʜ ɪs ᴛʜᴇ sᴛʀᴇᴀᴍ's ʟᴏɴɢɪᴛᴜᴅɪɴᴀʟ ᴘʀᴏғɪʟᴇ. ᴛʜᴇ ᴘʀᴏғɪʟᴇ ᴏғ ᴍᴏsᴛ sᴛʀᴇᴀᴍs ʙᴇɢɪɴs sᴛᴇᴇᴘ ᴀɴᴅ ɢʀᴀᴅᴜᴀʟʟʏ ʟᴇᴠᴇʟs ᴏᴜᴛ.
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