Describe how to make the following models with the help of objects found around you.
1. Sandclock model
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ғᴏʀ ᴍᴀᴋɪɴɢ ᴀ sᴀɴᴅ ᴄʟᴏᴄᴋ ʏᴏᴜ ᴄᴀɴ ᴜsᴇ ᴛᴡᴏ ᴘʟᴀsᴛɪᴄ ʙᴏᴛᴛʟᴇs ɪɴᴠᴇʀᴛᴇᴅ ᴏɴ ᴇᴀᴄʜ ᴏᴛʜᴇʀ's ᴏᴘᴇɴɪɴɢ ᴡɪᴛʜ ᴀ sᴍᴀʟʟ ʜᴏʟᴇ ғᴏʀ ᴛʜᴇ ᴘᴀssᴀɢᴇ ᴏғ sᴀɴᴅ ᴛʜʀᴏᴜɢʜ ᴛʜᴇᴍ.
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