1、study of the earth's surface; includes people's responses to topography and climate and soil and vegetation；

2、the aggregate of past events；

3、not easy; requiring great physical or mental effort to accomplish or comprehend or endure；

4、some situation or event that is thought about；

5、arousing or holding the attention；

6、any day except Sunday (and sometimes except Saturday)；

7、some abrupt occurrence that interrupts an ongoing activity；

8、actively or fully engaged or occupied；

9、a unit of time equal to 60 seconds or 1/60th of an hour。

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