Bí ẩn về từ trường Trái Đất đã được làm sáng tỏ
Cập nhật: 13:29 13/03/2007 GMT+7
Từ trường của Trái Đất có thể được tạo ra bởi các chuyển động mạnh của các chất dẫn điện lỏng trong lòng đất... Khám phá mới từ các nhà khoa học Pháp.
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