In order for an embryo plant to emerge from a seed and grow into a seedling, the seed coat must split open. Which diagram illustrates the force exerted by turgor pressure to split open the seed coat?
Gravity pulls down on the seed coat
Gravity pushes up on the seed coat
Water from the soil pushes in through the seed coat
Water within the seed pushed out against the seed coat
...

the answer to your question is:

c. complementary base-pairing

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

geologic time scale (for gradpoint) =)

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this