Question

how are sand dunes formed ?​

Answer 1

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ᴛʜᴇsᴇ ᴅᴜɴᴇs ғᴏʀᴍ ᴡʜᴇɴ ᴄᴏᴍᴘʟᴇx ᴡɪɴᴅ ᴘᴀᴛᴛᴇʀɴs ᴀʟᴛᴇʀɴᴀᴛᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴀɴᴅ ᴄʜᴀɴɢᴇ ᴛʜᴇ ᴡᴀʏ sᴀɴᴅ ɪs ᴘɪʟᴇᴅ ᴏɴᴛᴏ ᴛʜᴇ ᴅᴜɴᴇ. ᴡᴇᴀᴛʜᴇʀɪɴɢ ɪs ᴛʜᴇ ᴘʜʏsɪᴄᴀʟ ᴀɴᴅ/ᴏʀ ᴄʜᴇᴍɪᴄᴀʟ ʙʀᴇᴀᴋᴅᴏᴡɴ ᴏғ sᴜʀғᴀᴄᴇs ᴅᴜᴇ ᴛᴏ ᴡɪɴᴅ, ᴡᴀᴛᴇʀ, ᴏʀ ɪᴄᴇ. ᴇʀᴏsɪᴏɴ ɪs ᴛʜᴇ ᴘʀᴏᴄᴇss ᴏғ ᴍᴏᴠɪɴɢ ᴛʜᴇ ʙʀᴏᴋᴇɴ ᴅᴏᴡɴ ᴍᴀᴛᴇʀɪᴀʟ ғʀᴏᴍ ᴏɴᴇ ᴘʟᴀᴄᴇ ᴛᴏ ᴀɴᴏᴛʜᴇʀ ᴠɪᴀ ᴡɪɴᴅ, ᴡᴀᴛᴇʀ, ᴏʀ ɢʀᴀᴠɪᴛʏ.

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Answer 2

Answer:

Sand dunes are hill of sands that are made by wind as they blow across deserts or beaches