Answer:
Green house effect and human activity.
Explanation:
-The green house effect: Some gases in the atmosphere trap the heat and doesn't allow it to scape making the Earth warmer.
-Human activity: The industrial activities have increased the carbon dioxic levels that have contributed to the higher temperatures. Also, deforestation, fluorinated gases and fertilisers containing nitrogen have contributed to climate change.
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There are 50 states of the US
Explanation:
plate tectonics is where earths crust separates. into different plates there can be continental plated like continents and ocean plates
Volcanism describes these processes.