At which of the following plate boundaries is oceanic lithosphere destroyed?

Quartz, with a hardness of 7, will scratch calcite that has a hardness of 3.

After testing a hypothesis, you determine that the results of the test show your hypothesis is wrong. What is your next step according to the scientific method?

If an atom has an atomic mass of 19 and an atomic number of 7, how many neutrons are in the nucleus of the atom? 

Which of the following is the least dense?

Using the table below and answer correctly. PPF’s points and data for bicycles and cars Points Bicycles Cars A 5000 0 B 4800 100 C 4300 200 D 3400 300 E 0 400 Using the table above and drawing a Production Possibilities Frontier (PPF) with bicycle in the vertical axis and car in the horizontal axis we get the points [option1] on the PPF, hence, those points are called [option2] points. Any points under the PPF would be called [option3] points. The opportunity cost of an additional car on segment BC is [option4] and on segment CD is [option5]. Given the opportunity costs along the PPF, one can conclude that the PPF has a [option6] shape, as the opportunity costs along the PPF are [option7]. If a new tariff is imposed on steel, this will affect the production of both bicycles and cars, as importing steel becomes more expensive. As a result, we’d expect a [option8], since production would be reduced. 

Use the following to answer questions 21-22.  Figure: Gains from Trade (Figure: Gains from Trade) Refer to the figure. What are the unexploited gains from trade at the free market equilibrium?

(Figure: Gains from Trade) Refer to the figure. What are the total gains from trade at the free market equilibrium?

Use the following to answer questions 19-20.  Figure: Price and Quantity 1 (Figure: Price and Quantity 1) In the diagram, at which price is there a surplus?

Figure: Drums and Shoes Which of the following statements is most consistent with the above production possibilities frontier? Choose the best answer.