What is the main reason why the oceans are salty?
A) The early oceans were salty because comets are dirty snowballs.
B) Salt deposits that formed early in Earth's history become dissolved by modern oceans.
C) Weathering of rocks releases chemical elements that make the oceans salty.
D) Blowing salt crystals become incorporated into clouds and falls with the rainfall.
C) Weathering of rocks releases chemical elements that make the oceans salty.
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Which of the following is true of amylose?
A) It consists of as many as 4000 D-glucose units linearly linked by a(1 ? 4 ) glycosidic bonds. B) It consists of as many as 4000 D-glucose units linearly linked by b(1 ? 4 ) glycosidic bonds. C) It consists of as many as 10,000 D-glucose units linearly linked by a(1 ? 4 ) glycosidic bonds and there are branches every 24-30 units via a(1 ? 6 ) glycosidic bonds. D) It consists of as many as 10,000 D-glucose units linearly linked by b(1 ? 4 ) glycosidic bonds and there are branches every 24-30 units via b(1 ? 6 ) glycosidic bonds.
Which of the following is NOT conducive to the formation of a radiation fog?
a. Clear skies b. Calm winds c. Warm temperatures d. All of these are conducive.
The Sun produces which of the following?
A) Only radiant energy that is beneficial to life B) Only solar wind C) Mainly visible light and infrared energy D) Mainly ultraviolet and X-rays
Which part of Earth's cumulative hypsographic curve includes linear scars in the ocean floor, caused by the collision of two plates along convergent plate margins?
A) The gentle slope above sea level B) The long and flat part below sea level C) The shallowest slope below sea level D) The steep deepest part below sea level E) The steep segment above sea level