کانسار عبارت از ذخایر مواد معدنی موجود در زمین است که ارزش اقتصادی داشته باشد. عملیاتی که به شناسایی و …
My mother always thought that I was a genius. She decided that I was a genius based on one incident that happened when I was six years old. My mother called me into the bathroom. “Look at the sink.” The …
