Why do scientists interested in Earth’s magnetic field collect cores from rocks at the Mid-Atlantic Ridge?
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ɪᴛ sʜɪᴇʟᴅs ᴜs ғʀᴏᴍ ʜᴀʀᴍғᴜʟ ʀᴀᴅɪᴀᴛɪᴏɴ ғʀᴏᴍ ᴛʜᴇ sᴜɴ (ғɪɢᴜʀᴇ ʙᴇʟᴏᴡ). ᴇᴀʀᴛʜ's ᴍᴀɢɴᴇᴛɪᴄ ғɪᴇʟᴅ ᴘʀᴏᴛᴇᴄᴛs ᴛʜᴇ ᴘʟᴀɴᴇᴛ ғʀᴏᴍ ʜᴀʀᴍғᴜʟ ʀᴀᴅɪᴀᴛɪᴏɴ.
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ᴏᴄᴇᴀɴ ᴅʀɪʟʟɪɴɢ ᴄᴏʀᴇs ʜᴀᴠᴇ ʙᴇᴇɴ ᴜsᴇᴅ ᴛᴏ ᴄᴏɴғɪʀᴍ ᴛʜᴇ ᴀɢᴇ ᴏғ ᴛʜᴇ ᴏʟᴅᴇsᴛ ᴏᴄᴇᴀɴɪᴄ ᴄʀᴜsᴛ, ᴡʜɪᴄʜ ᴡᴀs ғᴏʀᴍᴇᴅ ᴀʙᴏᴜᴛ ᴍɪʟʟɪᴏɴ ʏᴇᴀʀs ᴀɢᴏ. ʙᴇᴄᴀᴜsᴇ ɪᴛ ɪs ᴍᴜᴄʜ ʏᴏᴜɴɢᴇʀ ᴛʜᴀɴ ᴛʜᴇ ᴀɢᴇ ᴏғ ᴛʜᴇ ᴇᴀʀᴛʜ, ᴛʜɪs ᴅɪsᴄᴏᴠᴇʀʏ ғᴜʀᴛʜᴇʀ sᴜᴘᴘᴏʀᴛᴇᴅ ᴛʜᴇ ᴄᴏɴᴄᴇᴘᴛ ᴛʜᴀᴛ ᴏᴄᴇᴀɴɪᴄ ᴄʀᴜsᴛ ᴄʀᴇᴀᴛᴇᴅ ᴀᴛ ᴍɪᴅ-ᴏᴄᴇᴀɴ ʀɪᴅɢᴇs ɪs ᴇᴠᴇɴᴛᴜᴀʟʟʏ ʀᴇᴄʏᴄʟᴇᴅ ᴀᴛ sᴜʙᴅᴜᴄᴛɪᴏɴ ᴢᴏɴᴇs.
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