What you're looking for in here is the hardness: a material can scratch another material if it's harder than it.
So the desired material cannot be harder than amphibole, which has a hardness of 6.
But it has to be harder than fluorite, which has a hardness of 4.
So we're looking for a hardness of between 4 and 6 and from the table we see it's magnesite (we'll need a hard magesite) - this is the correct answer!
Simon Bolivar was <span>was a </span>Venezuelan military and political leader. He played an important role in the establishment of Venezuela<span>, </span>Bolivia<span>, </span>Colombia<span>, </span>Ecuador<span>, </span>Peru<span> and </span>Panama<span> as sovereign states</span> . Liberty was his basic aim. He described liberty as "the only object worth the sacrifice of man's life'. According to him liberty was the <span>freedom from a colonial power.
Two reasons why Bolivar unpopular leader were that we was a tyrant and his stand on freedom.
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During the discussions that ensued, experts agreed that one of the main reasons for Africa's slow industrialization is that its leaders have failed to pursue bold economic
