________ has (have) been responsible for around 50% of the sea level rise over the last century.
A. A dip in the jet stream
B. Extreme weather events
C. Change in the Gulf Stream circulation
D. Melting and loss of ice
Answer: D
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According to most estimates, Earth is approximately
A. 4.6 million years old. B. 4.6 thousand years old. C. 4.6 billion years old. D. 4.6 trillion years old.
Preserved records of prehistoric organic activity such as tracks, trails, burrows, and nests are called ____
a. trace fossils b. carbonizations
c. casts d. molds e. permineralizations
Rocks that contain crystals that are roughly equal in size which can be identified without a microscope are said to exhibit this texture.
a) fine grained b) glassy c) porphyritic d) coarse grained e) pyroclastic
In addition to being hunted for and sold as pets, what is the main reason desert tortoise populations are in decline?
A) Habitat destruction and fragmentation B) Global warming C) Tortoise Shells being sold as souvenirs D) Tortoise meat is a delicacy in Tex-Mex cuisine