Big bang and nebular theories Flashcards
1
Q
Big bang
A
Approximately 13.8 billion years ago
It is the theory that the universe began as just a single point, then expanded and stretched to grow as large as it is right now - and is still stretching
2
Q
Nebular Theory
A
Approximately 4.6 billion years ago
It is the theory that our solar system formed from a cloud of dust and gasses (nebula)
3
Q
Earth’s four spheres
A
Atmosphere
Geosphere
Hydrosphere
Biosphere
