(( earth science ))

a caldera is a depression in a volcanic mountain. a caldera may form when

a.
the magma chamber cools, hardens, and widens

b.
mountain rocks melt into lava and flow downhill

c.
the mountain collapses into an emptied magma chamber

d.
wind and water erode the center of the mountain

14) whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.