Multiple Choice
Oxygen in Earth's atmosphere is derived from ________.
A) volcanic outgassing
B) photosynthesis
C) animal respiration
D) water from the oceans breaking down into hydrogen and oxygen during evaporation
Correct Answer:
Verified
Correct Answer:
Verified
Q5: The first mammals appeared during the _
Q13: An iridium-rich layer of clay,glass spherules,and shocked
Q14: Toward the end of the Archean Eon,_.<br>A)the
Q15: A fold-thrust belt is _.<br>A)a low-lying region
Q16: Earth was hotter than today during the
Q16: Archean greenstones are formed from<br>A) basalts produced
Q20: Once an ancient mountain range is destroyed
Q21: Animals and plants are both _.<br>A)autotrophs<br>B)eukaryotes<br>C)archea<br>D)prokaryotes
Q23: Earth is approximately how old?<br>A)14 billion years<br>B)4.57
Q32: The eon represented by abundant deposits of