Pluto was discovered in 1930, becoming the 9th planet in the solar system. As telescopes improved, other Sun-orbiting objects were discovered. Some of those were even larger than Pluto. By 2005, it was becoming apparent that many more objects would soon be discovered and that the number of planets in the Solar System could swell to as many as 50. After much debate, scientists in the International Astronomical Union (IAU) concluded that Pluto and the other similar celestial bodies orbiting the Sun should be classified as "dwarf" planets. Since a "planet" must clear the space surrounding its orbit, our Solar system now has 8 planets.Pluto still exists, so how do you explain that we now officially only have 8 planets in our solar system?
A. Scientific explanations are tentative.
B. Scientific explanations make predictions.
C. Science is limited by technology.
D. Science is based on empirical observations.
Answer: A
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According to the following reaction, which molecule is acting as a base? H3O+ + HSO4- ? H2O + H2SO4
A) H2SO4 B) H2O C) H3O+ D) HSO4- E) none of the above
List and describe the four types of bonds exhibited in minerals. Give an example of a mineral that exhibits each type of bond
What will be an ideal response?
________ is produced when grains of quartz in sandstone are welded together when the rock is subjected to high temperatures.
A. Monzonite B. Quartzite C. Marble D. Limestone E. Granite
Although greenhouse gas concentration has increased steadily over the last century (see Figure 24-1), based on your answers for questions 3 and 4, is increased greenhouse effect likely to be the only factor influencing temperature change in these cities? Why?
The question is based on Figure 24-6, a chart showing average annual temperature from 1905 to 2015 in three U.S. cities: Nome, Alaska; Bozeman, Montana; and Tucson, Arizona.