According to the speaker, what is the main reason ore deposits are harder to find today?
"Of all the past mines we know of, they were easy because they were poking out of the surface and they were near the surface. So we need to look deeper."
Bildiğimiz tüm geçmiş madenler kolaydı çünkü yüzeyden dışarı çıkıyorlardı ve yüzeye yakındılar. Bu yüzden daha derine bakmalıyız.