Describe two ways in which sinkholes form
What will be an ideal response?
Sinkholes can form when the limestone immediately below the soil is dissolved by downward-seeping rainwater that is freshly charged with carbon dioxide. These types of sinkholes are usually shallow depressions with relatively gentle slopes. Sinkholes can also form when the roof of a cavern collapses under its own weight. These types of sinkholes are normally deep with steep sides.
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The Nature Conservancy, World Wildlife Fund, Greenpeace and the Grameen Bank are examples of non-governmental organizations working toward environmental conservation.
Answer the following statement true (T) or false (F)
The highest infection rates of HIV/AIDS are in
A. Western Africa B. Eastern Africa C. Central Africa D. Southern Africa
Give a brief overview of the terrestrial carbon cycle. Include the source of carbon that enters terrestrial ecosystems, how carbon moves through ecosystems, and how carbon ultimately leaves ecosystems
Explain how part of this cycle is believed to contribute to global climate change.
In coral reefs, clownfish live unharmed among the poisonous tentacles of sea anemones. The sea anemones protect the clownfish from predation, while the clownfish scare off predators, such butterfly fish, which would otherwise eat the anemones
The clownfish may also provide important nutrients to the anemones. This is an example of which symbiotic relationship? A) parasitism B) mutualism C) commensalism D) amensalism