Suppose that two stars in a binary star system are separated by a distance of 80 million kilometers and are located at a distance of 150 light-years from earth.
a) what is the angular separation of the two stars in degrees?
b) what is the angular separation in arceseconds?

When volcanoes erupt, magma (hot, molten rock) rises toward the surface of the earth. as magma cools, solid rock forms. this rock contains substances from the interior of the earth. which of the following natural resources is likely to be plentiful near subduction zones where volcanic activity has occurred in the past?

Although china’s total economic output, measured by gross domestic product (gdp), is third largest in the world, it is considered a developing nation. what is most likely the most important factor for this designation? a. china’s government spends money on things that do not benefit human development. b. china has a large population, so its gdp per person is only modest. c. china has a strong economy but weak literacy and school attendance rates. d. china’s high rates of disease offset the country's economic gains.

In a river, which of the following would most likely be carried by suspension? this is called