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
Geography, 23.06.2019 23:40
Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.
Answers: 2
Geography, 24.06.2019 07:30
Horizon a is also sometimes called a. topsoil b. subsoil c. bedrock d. weathered bedrock
Answers: 2
Chemistry, 31.07.2019 00:30
Geography, 31.07.2019 00:30
Computers and Technology, 31.07.2019 00:30
Mathematics, 31.07.2019 00:30
English, 31.07.2019 00:30
English, 31.07.2019 00:30
Computers and Technology, 31.07.2019 00:30
Mathematics, 31.07.2019 00:30