For an observer at the north geographic pole what dates would the sun appear to stay on the horizon all day long neither rising nor setting

What major factors play a role in global warming? 1. human activity and normal climate conditions 2. natural factors and human activity 3. normal climate conditions and abnormal human activities 4. abnormal human activities and natural factors

Maria is going to a hiking trip this weekend. she has been busy shopping for the trip. which of these items that she bought are a want for her?

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic