On a political globe or world map follow the International Date Line across the Pacific Ocean. Why do you think the International Date Line is not straight but zigs and zags?
What will be an ideal response?
The International Date Line zigzags to avoid local confusion. If the Date Line passed through a country, imagine the confusion of having the country split with each side experiencing a different day! Political reasons exist as well. The island country of Kiribati moved the International Date Line to its eastern margin (150° west longitude) to be the first to experience each new day. These distortions of the IDL only apply to the countries and their territorial waters and not to international waters between them and the 180th meridian.
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Some of the offspring of a beetle develop spots. These spots make it harder for birds to see the beetles and thus, the spotted beetles tend to survive and produce more offspring than the beetles without spots. This heritable trait is called a(n) ____________________.
Fill in the blank(s) with the appropriate word(s).
If the temperature at the surface of Earth (at sea level) is 40°C, what is the temperature at 2000 m if the normal lapse rate is 6.4°C/1000 m?
A) 33.6°C B) 46.4°C C) 60°C D) 52.8°C E) 27.2°C
Which of the following is not a source of deep water in the ocean?
A) Southern subpolar latitudes B) Northern subpolar latitudes C) Subtropical convergences D) Arctic convergence E) Antarctic convergence
Competition for _______________ drives the need for smaller countries to join the EU to compete economically in the global marketplace.
-material wealth -resources -both labor and resources -investments -labor