What is the primary source of temperature data used to analyze long-term climate trends?
Explanation: The correct answer is B) Surface weather stations. Surface weather stations are the primary source of temperature data used to analyze long-term climate trends. These stations are located worldwide and measure temperature at specific locations. The data collected from these stations are crucial for understanding temperature trends and detecting anomalies over time.
What is a temperature anomaly?
Explanation: The correct answer is C) The difference from a long-term average temperature. A temperature anomaly refers to the deviation or difference from a long-term average temperature for a specific time period. It provides a measure of how much warmer or cooler the temperature is compared to the average, helping to identify unusual temperature patterns and trends.
Which of the following is an example of a temperature trend observed in recent decades?
Explanation: The correct answer is C) Gradual warming of the Earth's surface. One of the prominent temperature trends observed in recent decades is the gradual warming of the Earth's surface. Climate records and scientific studies have shown an overall increase in global temperatures, indicating a warming trend. This trend is consistent with the influence of greenhouse gas emissions and human activities on the Earth's climate system.
What does positive temperature anomaly indicate?
Explanation: The correct answer is C) Above-average temperature. A positive temperature anomaly indicates that the observed temperature is above the long-term average for a specific time period. It suggests that the temperature is higher than what is typically expected during that time, reflecting a warming trend or an unusually warm period.
What are the primary factors contributing to long-term temperature trends?
Explanation: The correct answer is B) Human activities and land-use changes. Long-term temperature trends are primarily influenced by human activities, including the emission of greenhouse gases (such as carbon dioxide) from burning fossil fuels and changes in land use (such as deforestation). These factors contribute to the enhanced greenhouse effect and alter the energy balance of the Earth's climate system, leading to long-term temperature changes.