What percent of the world's energy comes from burning fossil fuels?
a. less than 50%
b. 50% to 60%
c. 60% to 70%
d. 70% to 80%
e. more that 80%
E
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Continental crust is very buoyant compared with oceanic crust because continental crust is
A) predominantly composed of basaltic rock that contains many air bubbles from successive lava flows. B) predominantly composed of granitic rocks, whereas oceanic crust is composed of basaltic rocks. C) thinner than the oceanic crust, forming a thin upper skin on the oceanic crust below. D) very young and fresh.
The Earth has functioned as a life-supporting self-sustaining system for over 8 billion years. Indicate whether the statement is true or false
Why is sensible heat detectable while heat that is not sensible cannot be measured?
A) A thermometer can measure the decrease in temperature but not heat capacity. B) The latent heat of fusion cannot be calculated. C) Heat that is not sensible and heat that is sensible can both be measured. D) A thermometer measures the decrease in temperature, but as liquid changes to solid, the loss of heat is not measurable.
About ________% of the Great Barrier Reef is healthy coral
A) 10 B) 20 C) 35 D) 50