When may a hypothesis be revised?

A - never

B - based on experimental data

C - after it has been proven to be correct

D - after at least one year from when it was first tested

Using four or more complete sentences, differentiate between federal and confederate systems of government.

Review the information presented in the section "Urban and Rural Definitions." How does the US Census Bureau define an urban area? (Site 1)

Civil war broke out in Algeria in 1992 a. when Christians took over the government. b. when the election was cancelled to prevent a Muslim victory. c. in an effort to gain independence from France. d.

The numbers of hours spent commuting to work by the employees of a company Is each data set qualitative or quantitative?

Do valcanos impact global warming?

How high does the earth's atmosphere extend? A. 100 m B. 1,000 m C. 10 km D. 100km

How to grow plants in space?

Based on this map of oil imports, which nation imported the greatest number of oil barrels each day in the years before 2006? A. China B. Australia C. Canada D. the United States

How far will a P-wave travel in 9 min 20 sec?

The land in Mexico City is sinking. What is the primary cause of this problem? A. deforestation caused by cutting down trees B. too much water being taken from underground aquifers C. too many offices and towers being built in the city D.