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What type of plate boundary is the Mid-Atlantic Ridge?

The planet Mercury has a highly eccentric orbit. What does “eccentric” mean in this context?

Which of the following statements is true about the Earth’s crust?   I. It “floats” on the mantle.   II. It constitutes less than 1% of the Earth’s mass.   III. It has an average density of 2.8 g/cm3.

A person who says, “that’s only a theory” likely doesn’t know that a scientific theory is a

In the following, which position corresponds to the Summer Solstice?  

What is the scientific principle under which sediments are assumed to be deposited in flat-lying layers?

A theory is supported mainly by

The early Earth experienced two global melting events. The first was caused predominantly by __________, and the second was caused predominantly by __________.

Which of the following is not a requirement for a material to be classified as a mineral?

Atoms combine to form minerals. What do minerals combine to form?