The sedimentary rock ____ forms from the burial and compaction of land plants.?

What aluminosilicate polymorph is stable at a pressure of 1.5 kilobars and a temperature of 600 degrees C?

A) sillimanite B) kyanite C) sillimanite and kyanite D) andalusite

On a large urban or industrial scale, biogas can be produced

A) by using crushed fresh corn in an aerobic tank. B) from municipal wastewater treatment, landfills and food waste. C) using enzymes to degrade cellulose to glucose and then fermenting. D) drilling into areas adjacent to petroleum deposits.

Which of the following is true of red blood cells?

A) They circulate in the blood for about 1 month. B) They are called leukocytes. C) They have DNA. D) None of these is true.

What is a main hazard of this type of volcano?

A. hot fragments thrown a short distance from the volcano B. destruction by moderately fluid lava flows that can flow far from the volcano C. volcanic mudflows and landslides D. burning, building collapse, and suffocation from an eruption column and pyroclastic flows