What are some of the advantages and disadvantages of using biomass as fuel?
What will be an ideal response?
Advantages: widely available; can be made from fast growing plants and waste materials; can be converted to biofuels; eases some strain on petroleum based fuels.Disadvantages: produces net CO2 emissions if it is used faster than it can be replaced; soil erosion and habitat destruction can result if large areas of land are cleared; less biomass is available for fertilizers; open fires and inefficient stoves can have harmful human health effects; may compete with food sources.
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Large-scale human impacts on the climate may have started how long ago?
A) only 200 years ago B) 2,000 years ago C) 8,000 years ago D) 100,000 years ago
Which of the following pairs lists an r-selected organism followed by a K-selected organism?
A) elephant; whale B) pine tree; dandelion C) dandelion; pine tree D) grasshopper; whale E) elephant; pine tree
Human blood contains which of the following buffers?
A) H2CO3/HCO3- B) H2PO4-/HPO42- C) both a and b D) neither a nor b
Marine geologists can predict the age of igneous rocks of the sea floor by measuring ________.
A. the velocity of earthquake waves B. magnetic anomalies C. their grain size D. the percent of iron-rich minerals in the rock E. their density