What forms when magma erupts from volcano as liquid rock (lava) and hardens in the cool air?
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Extrusive Igneous Rocks.
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ᴇxᴛʀᴜsɪᴠᴇ ɪɢɴᴇᴏᴜs ʀᴏᴄᴋs:
ᴛʜᴇsᴇ ᴀʀᴇ ᴛʜᴇ ʀᴏᴄᴋs ᴛʜᴀᴛ ғᴏʀᴍ ᴀᴛ ᴇʀᴜᴘᴛɪɴɢ ᴠᴏʟᴄᴀɴᴏᴇs ᴀɴᴅ ᴏᴏᴢɪɴɢ ғɪssᴜʀᴇs. ᴛʜᴇ ᴍᴀɢᴍᴀ, ᴄᴀʟʟᴇᴅ ʟᴀᴠᴀ ᴡʜᴇɴ ᴍᴏʟᴛᴇɴ ʀᴏᴄᴋ ᴇʀᴜᴘᴛs ᴏɴ ᴛʜᴇ sᴜʀғᴀᴄᴇ, ᴄᴏᴏʟs ᴀɴᴅ sᴏʟɪᴅɪғɪᴇs ᴀʟᴍᴏsᴛ ɪɴsᴛᴀɴᴛʟʏ ᴡʜᴇɴ ɪᴛ ɪs ᴇxᴘᴏsᴇᴅ ᴛᴏ ᴛʜᴇ ʀᴇʟᴀᴛɪᴠᴇʟʏ ᴄᴏᴏʟ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ ᴏғ ᴛʜᴇ ᴀᴛᴍᴏsᴘʜᴇʀᴇ.
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