How do lava tubes form in basaltic lavas? How can the exterior solidify if the interior is still fluid?
What will be an ideal response?
Answer: The exterior of the lava flow cools, but the interior is still hot and fluid (rocks are poor conductors of heat). The fluid lava drains away, leaving the hollow tubes behind.
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200 million years ago Earth's continents were all joined in one supercontinent known as Gondwanaland
Indicate whether the statement is true or false.
To feed its young, an owl captures mice that eat grains. The owl also eats small snakes that feed on these mice. The diet of owls represents the roles of
A) a first order and second order consumer. B) a second and third order consumer. C) an herbivore and a carnivore. D) a producer and a consumer.
Why is nuclear fusion superior to the currently used process of nuclear fission?
A) It generates little to no nuclear waste. B) It is cheaper to build nuclear fusion power plants. C) The technology is readily available and can be shared with developing world countries. D) It is impossible for accidents to occur in plants that use nuclear fusion. E) Nuclear fusion power plants are smaller in size, and thus can be built close to where people will consume the power.
Ozone
A. is destroyed by halogens in chlorofluorocarbons. B. is only destroyed through natural processes. C. is only formed through natural processes. D. is formed mainly in the troposphere where it diffuses to the stratosphere.