1. What are the flat layers that form as rocks are squeezed
called?

A: foliation
B: layers
C: hornfels
D: bedding planes

2. Sediments come together by these processes to create sedimentary

A: rocks.
B: compaction and cementation
C: precipitation and cementation
D: compaction and precipitation
3: compaction, cementation and precipitation

A: Regional metamorphism is due to extreme pressure caused by
heat from magma
B: water pressure
C: the weight of overlying rock
D: atmospheric pressure

4. When sediments are buried the weight above them can make them into rocks. When they are buried by more weight they can become rocks.

A: regional metamorphic; intrusive igneous
B: cemented sedimentary; intrusive igneous
C: clastic sedimentary; contact metamorphic
D: clastic sedimentary; regional metamorphic

5. For an igneous rock to become a metamorphic rock it must

A: melt and then cool
B: be broken into fragments and then cemented together
C: change composition or mineral shape by heat or pressure
D: An igneous rock cannot become a metamorphic rock.

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.

What household products contain algae?

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.