The energy released by a magnitude 8 quake on the Richter scale is how many times greater than that of a magnitude 6 quake?
A) 3.15 B) 31.5 C) 63 D) 992 E) 31,255
D
You might also like to view...
Planting crops in alternating rows of close-growing plants
A. creates windbreaks. B. is called strip cropping. C. is called crop rotation. D. increases erosion rates. E. decreases soil's water holding capacity.
What might be present to cause a reddish color in a soil horizon?
A) organic materials B) bedrock C) aluminum and iron oxides D) clay minerals
All carbon atoms have six (6 ) protons but the number of neutrons can be six (6 ), seven (7 ), or eight (8 ). Different neutron numbers ____
A)force the atom to bond with elements that it normally would not B)change the atom's atomic mass number and make it an isotope C)cause the atom to be more or less reactive D)change the atom's atomic mass number and make it an ion E)cause the atom to be unstable
A ________ is an uncontrollable mega-fire covering more than 100,000 acres and burns at high intensities that leave little life behind.
A. brush fires B. fire tornadoes C. pyro-storms D. firestorm