Answer:
Explanation: Global warming associated with large accumulations of carbon dioxide in the atmosphere over millions of years, emitted primarily by volcanic activity, is the proposed trigger for melting a snowball Earth.
Answer:A. Volunteering for a political campaign.
Explanation:
Political participation can be achieved by volunteering the political campaign which is leading towards a agenda which include a motive for the betterment of society. This is the direct method for political contribution.