The weather 100 years ago would have varied depending on the location and time of year. However, overall, the climate would have been influenced by natural climate patterns and not by human-induced climate change. There may have been periods of extreme weather events, such as droughts, floods, or heatwaves, but these would have been part of natural climate variability rather than the result of human activities. Overall, the weather 100 years ago would have been different from today due to natural climate cycles and variations. **

Systematic observation in field research involves the structured and planned collection of data through direct observation of a specific phenomenon, often using predetermined categories or criteria. On the other hand, participant observation involves the researcher immersing themselves in the social setting being studied, actively participating in the activities and interactions of the group being observed. While systematic observation allows for a more objective and standardized approach to data collection, participant observation provides a deeper understanding of the social context and dynamics by experiencing it firsthand. Ultimately, the main distinction lies in the level of involvement and interaction between the researcher and the subjects of the study. **

Systematic observation in field research involves the structured and predetermined collection of data based on specific variables or behaviors of interest. Researchers use predefined criteria to guide their observations and ensure consistency in data collection. On the other hand, participatory observation involves the researcher immersing themselves in the social setting being studied, actively participating in the activities of the group being observed. This approach allows the researcher to gain a deeper understanding of the context and culture of the group, but may be more subjective and less structured compared to systematic observation. **

Yes, there has always been variability in weather patterns throughout history, including 100 years ago. Weather patterns are influenced by a variety of factors, including natural climate cycles, volcanic activity, and human activities. While there may have been periods of extreme weather events and variability in the past, the current understanding of climate change suggests that human activities are contributing to more frequent and intense weather extremes. Therefore, while variability in weather has always existed, the current rate of change and extreme events may be influenced by human-induced climate change. **

No, 100 is not worth more than 100. In terms of numerical value, both 100s are equal. However, the context in which they are used may determine their worth or value. **

No, a 100 mW laser pointer would not be able to illuminate the space station. The space station is located in low Earth orbit, approximately 400 kilometers above the Earth's surface. The laser pointer's beam would disperse and weaken over such a long distance, making it impossible to illuminate the space station. Additionally, the space station is equipped with various external lights and reflective surfaces for visibility, so a laser pointer would not be necessary for illuminating it. **

Objective criteria in weather observation are measurable and quantifiable factors that are used to describe the current weather conditions. These criteria include temperature, humidity, wind speed and direction, precipitation amount, cloud cover, and atmospheric pressure. By using objective criteria, meteorologists can provide accurate and consistent information about the weather, which is crucial for making informed decisions and predictions. **

The phrase "After 100 meters" implies that something will happen once a distance of 100 meters has been covered. On the other hand, "After 100 meters?" suggests a question about what will happen after 100 meters. The first phrase is a statement, while the second is an inquiry seeking clarification or information. **