The United Nations measures the average income in countries through a complex index called:
A) Gross domestic product
B) Annual gross national income per capita at purchasing power parity
C) Gross national income at HDI
D) Annual gross national product at average income
E) Development index at purchasing power parity
Answer: B
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High-latitude climates are characterized by two important features: low average temperatures and extreme seasonal variability
Indicate whether the statement is true or false.
A "mystery" in our understanding of plate tectonics has been, until recently, the nature of the power source capable of moving the plates and the continents embedded within them. Recent evidence indicates the power source to be ____
A) the readjustment of the surface to continual shrinking of the whole Earth B) convection currents within Earth's mantle moving the plates C) the action of ocean currents dragging along the seafloor, causing the seafloor and the continents to move D) the continual vibration from earthquakes and volcanoes slowly moves the continents equator-ward under the influence of centrifugal force
The atomic mass number of an atom is the total number of ________ in the atom.
A. protons B. neutrons C. protons, neutrons, and electrons D. protons and neutrons E. electrons
Air masses moving south from Canada are likely to be cold and dry.
Answer the following statement true (T) or false (F)