[Answered] Earth's atmosphere became oxygen rich about 2.45 _______

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Author Question: Earth's atmosphere became oxygen rich about 2.45 ________ years ago. A) billion B) million C) ... (Read 45 times)

audragclark

Hero Member
Posts: 579

on: Aug 22, 2018

Earth's atmosphere became oxygen rich about 2.45 ________ years ago.

A) billion
B) million
C) trillion
D) thousand

Question 2

All true oceanic islands are ________ in origin.

A) collisional
B) erosional
C) metamorphic
D) sedimentary
E) volcanic

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jasonq

Sr. Member
Posts: 335

Reply #1 on: Aug 22, 2018

Answer to Question 1

A

Answer to Question 2

E

audragclark

Member
Posts: 579

Reply 2 on: Aug 22, 2018

Wow, this really help

shewald78

Member
Posts: 340

Reply 3 on: Yesterday

Thanks for the timely response, appreciate it

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Author Question: Earth's atmosphere became oxygen rich about 2.45 ________ years ago. A) billion B) million C) ... (Read 45 times)

audragclark

Earth's atmosphere became oxygen rich about 2.45 ________ years ago. A) billion B) million C) ...

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jasonq

Earth's atmosphere became oxygen rich about 2.45 ________ years ago. A) billion B) million C) ...

audragclark

shewald78