Geologists divide earth’s long history into smaller units that make up the geologic time scale.
a. true
b. false

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

Draw metallic bonding if two copper