4. estimate the time necessary for the spread of the south atlantic ocean between africa and south america by dividing the present separation along the trace of the red dashed line on figure 11.2 by the rate of spreading as calculated in question 2. ritter, scott. interpreting earth history: a manual in historical geology (p. 159). waveland press, inc.. kindle edition.

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles