In 2012, the world human population surpassed
A) 1 billion. B) 3 billion. C) 4 billion. D) 6 billion. E) 7 billion.
E
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How do intertidal organisms separate themselves?
a. Zones based on the substrate brought in from the tides b. Zones based on the amount of submergence or emergence in water c. Zones based on the height of the tides d. Zones based on the amount of nutrients brought in from the tides.
Obsidian is characterized by its ________ texture
A) course-grained B) fine-grained C) vesicular D) glassy
________ is an increase in the general level of the prices of goods and services
Fill in the blank(s) with correct word
Which is TRUE of the amount of CO2 in our atmosphere?
A) The level of CO2 increased at the rate of 1.1% per year from 1990 to 1999. B) The level of CO2 has been much higher during the past 800,000 years than it is now. C) CO2 is the most abundant gas in the atmosphere. D) The level of CO2 has been decreasing at the rate of 3.1% per year since 2000.