Which of the following factor(s) enable(s) the existence of liquid water on the Earth's surface?
A. The Earth's atmospheric gases
B. Rotation of the Earth on its axis
C. Earth's solar orbit and the Earth's atmospheric gases
D. Earth's solar orbit
E. All of these are correct.
Answer: E
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The most important element in Eratosthenes' calculation of Earth's size was that the angle measurements of the Sun's rays with the pillar and reflection of sunlight in the well be
A. the same rays of the Sun. B. exact. C. simultaneous. D. tested by other observers.
Degradation of soil fertility has no effect on the farmland needed to feed the world by diminishing its availability.
Answer the following statement true (T) or false (F)
What element is behaves as the oxidizing agent in the following equation and what element behaves as the reducing agent? Sn2+ + 2 Ag ? Sn + 2 Ag?
A) The tin ion, Sn2+, is the oxidizing agent while silver, Ag, is the reducing agent. B) The tin ion, Sn2+, is the reducing agent while silver, Ag, is the oxidizing agent. C) The tin, Sn, is the reducing agent while silver ion, Ag?, is the oxidizing agent. D) The tin, Sn, is the oxidizing agent while silver ion, Ag?, is the reducing agent.
Economic and political cooperation in the European Union takes the form of all but which of the following?
A) Subsidies are provided to economically depressed areas. B) Transfer of finished products between countries is simplified. C) With few exceptions, citizens may live in one country but work in another without political difficulty. D) Every member country must adopt the Euro currency. E) A European Parliament is elected by member states.