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Answer : because these are occurred by the processes beneath the surface of the earth. This process starts occuring from inside the Earth. That's why Earthquakes & Volcanic eruption called Endogenic factors.
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ғᴀᴜʟᴛɪɴɢ ᴏʀ ʀᴜᴘᴛᴜʀᴇ ᴏғ ᴘʟᴀᴛᴇs, ᴘʀᴏᴅᴜᴄᴇ sᴇɪsᴍɪᴄ ᴡᴀᴠᴇs ᴡʜɪᴄʜ ɢɪᴠᴇ ʀɪsᴇ ᴛᴏ ᴇᴀʀᴛʜϙᴜᴀᴋᴇs ᴏɴ ᴛʜᴇ sᴜʀғᴀᴄᴇ. ᴇᴀʀᴛʜϙᴜᴀᴋᴇ ᴀɴᴅ ᴠᴏʟᴄᴀɴɪᴄ ᴇʀᴜᴘᴛɪᴏɴs ᴀʀᴇ ᴄᴀʟʟᴇᴅ ᴇɴᴅᴏɢᴇɴɪᴄ ғᴀᴄᴛᴏʀs ʙᴇᴄᴀᴜsᴇ ᴛʜᴇʏ ᴀʀᴇ ᴏʀɪɢɪɴᴀᴛɪɴɢ ᴀɴᴅ ᴘʀɪᴍᴀʀɪʟʏ ᴄᴏɴᴛʀᴏʟʟᴇᴅ ʙʏ ᴛʜᴇ ᴇᴀʀᴛʜs ɪɴᴛᴇʀɪᴏʀ ᴘʀᴏᴄᴇssᴇs.
ᴘʟᴀᴛᴇs sʟɪᴅɪɴɢ ᴘᴀsᴛ ᴇᴀᴄʜ ᴏᴛʜᴇʀ ᴄᴀᴜsᴇ ғʀɪᴄᴛɪᴏɴ ᴀɴᴅ ʜᴇᴀᴛ. sᴜʙᴅᴜᴄᴛɪɴɢ ᴘʟᴀᴛᴇs ᴍᴇʟᴛ ɪɴᴛᴏ ᴛʜᴇ ᴍᴀɴᴛʟᴇ, ᴀɴᴅ ᴅɪᴠᴇʀɢɪɴɢ ᴘʟᴀᴛᴇs ᴄʀᴇᴀᴛᴇ ɴᴇᴡ ᴄʀᴜsᴛ ᴍᴀᴛᴇʀɪᴀʟ. sᴜʙᴅᴜᴄᴛɪɴɢ ᴘʟᴀᴛᴇs, ᴡʜᴇʀᴇ ᴏɴᴇ ᴛᴇᴄᴛᴏɴɪᴄ ᴘʟᴀᴛᴇ ɪs ʙᴇɪɴɢ ᴅʀɪᴠᴇɴ ᴜɴᴅᴇʀ ᴀɴᴏᴛʜᴇʀ, ᴀʀᴇ ᴀssᴏᴄɪᴀᴛᴇᴅ ᴡɪᴛʜ ᴠᴏʟᴄᴀɴᴏᴇs ᴀɴᴅ ᴇᴀʀᴛʜϙᴜᴀᴋᴇs.
ᴡʜᴇɴ ʜᴏᴛ ᴍᴏʟᴛᴇɴ ᴍᴀɢᴍᴀ sᴜᴅᴅᴇɴʟʏ ᴇʀᴜᴘᴛs, ɪᴛ ɪs ᴄᴀʟʟᴇᴅ ᴀ ᴠᴏʟᴄᴀɴᴏ.