Need help with 45 and 46 What properties of the source magma lead to the formati

Question

Need help with 45 and 46 What properties of the source magma lead to the formation of a shield volcano? Low viscosity and mafic composition Any intermediate composition magma that encounters seawater in the magma chamber Any magma composition so long as it contains a large portion of dissolved volatiles High viscosity and felsic composition When CO_2 in the atmosphere increases, what happens to the oceans? CO_2 in the atmosphere is not related to CO_2 or pH in the ocean CO_2 in the ocean increases and pH increases CO_2 in the ocean decreases and pH increases CO_2 in the ocean increases and pH decreases CO_2 in the ocean decreases and pH decreases

Explanation / Answer

QUESTION 45: ANSWER: low viscosity and mafic composition Explanation: The shape of the shield volcanoes is due to the low viscosity of the mafic content in the lava. This low viscosity makes the lava to travel and form shield like shapes. QUESTION 46: ANSWER: CO2 IN THE OCEAN INCREASES AND THE pH DECREASES EXPLANATION: This is called ocean acidification where the ocean absorbs the CO2 from the atmosphere and since the sea is basic i.e. pH greater than 7, due to absorption of carbon dioxide, the pH value is decreasing.

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