When does a protostar become a true star?
A) when the star is 1 million years old
B) whe...
Geography, 15.04.2020 01:01 Jingobob442
When does a protostar become a true star?
A) when the star is 1 million years old
B) when the central temperature reaches 1 million Kelvin
C) when nuclear fusion begins in the core
D) when the thermal energy becomes trapped in the center
E) when the stellar winds and jets blow away the surrounding material
Answers: 2
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Northeastern china, north korea, northern japan containing coniferous forests, temperate grasslands, and agriculture, are all part of what climate zone? a. tropical desertb. desertc. humid subtropicald. humid continental
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Which statement best describes a spring? explain. the top of the saturated zone an underground layer of rock or sediment that holds groundwater groundwater flowing naturally to the surface where it is lower than the water table a vent in earth’s surface that periodically ejects a column of hot water and steam
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