Approximately ________ countries are currently experiencing water shortages
A) 5
B) 10
C) 80
D) 165
C
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What strategy would increase the threat of climate change?
A. Improve energy efficiency. B. Shift from fossil fuels to a mix of carbon-free energy resources. C. Stop cutting down tropical forests. D. Capture and store as much carbon dioxide as possible. E. Continue with current practices.
What two events likely caused the extinction event at the end of the Cretaceous?
A. a massive fall in sea level and volcanic eruption B. an ice age and asteroid impact C. the evolution of mammals and an ice age D. a global fire and related fireball impacts E. an asteroid impact and massive flood basalt eruption
Molecular oxygen (O2 ) in Earth's early atmosphere probably originated from the splitting of water vapor (H2O) into hydrogen and oxygen
Indicate whether the statement is true or false
The specific heat of lead is 0.0380 cal/g·°C. If 47.0 calories of energy raised the temperature of a lead sample from 28.3°C to 30.1°C what is the mass of the sample?
A) 26 g B) 690 g C) 1.2 x 10^3 g D) 2.3 x 10^3 g