What two processes contributed oxygen to earth’s second atmosphere? a. photosynthesis and volcanism
b. volcanism and weathering
c. weathering and rainfall
d. photosynthesis and photolysis

we need the questions , i may then you.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

i think its 5049.

i hope this !