Kevin is describing the orbit of earth. at what point in earth’s orbit is earth farthest from the sun?
a)when earth reaches aphelion
b)when earth reaches perihelion
c)when earth reaches its fastest speed
d)when earth reaches its average distance from the sun

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.