Which of the following countries shows high urban population concentration in more than one urban area?
What will be an ideal response?
Vietnam
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What are trophic levels? Why is it better to eat organisms lower on the tropic pyramid? What will be an ideal response?
A mineral can have both Cleavage and Fracture.
Indicate whether the statement is true or false
What is the source of food, the first link in the food chain, in deep-sea hydrothermal vent communities?
a) cyanobacteria performing photosynthesis b) black smokers providing hot water c) heterotrophs eating dead whale carcasses d) archaea performing chemosynthesis e) all of the above
The Rotterdam subway was built by
A. building the tunnel in segments which were flooded, sunk into position, then joined and pumped dry. B. draining water from below the city to allow excavation of a dry tunnel. C. baking the ground to harden the clays, then blasting the tunnel through. D. raising the tunnel on stilts to keep it above the local water table.