A wind shift from east to south and an increase in temperature is indicative of the passage of:
a. a cold front.
b. a warm front.
c. an occluded front.
d. None of these
B
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An estimated 82% of the Guiyu (China) area's children younger than age 6 suffer from lead poisoning as direct result of electronic waste.
Answer the following statement true (T) or false (F)
Which of the following explains the blue colour of the sky?
A. transmission of visible light through the ozone layer in the Earth's stratosphere B. filtering effect of water vapour in the Earth's atmosphere C. selective scattering of visible light by air molecules D. reflection of sunlight off the Earth's oceans
Across the developing world, children are considered an economic investment because they will be able to work and contribute to the family's income.
a. true b. false
The weak ________ of its molecules gives water many of its interesting properties
A) spin B) color C) shells D) expansion E) electrical polarity