Answer :
The global average temperature. Scientific information taken from natural sources (such as ice cores, rocks, and tree rings) and from modern equipment (like satellites and instruments) all show the signs of a changing climate. From global temperature rise to melting ice sheets, the evidence of a warming planet abounds.
An area where two plates converge is referred to as a convergent border. The borders of one or both colliding plates may bow up into mountain ranges as a result of the impact, or one plate may bend downward into a deep undersea trench. At the surface of the Earth and above, scientists, unpaid observers, and automated instruments from all around the world measure climate variables. Air chemistry, temperature, precipitation, cloud cover, and wind speed are some of the data gathered. Since 1901, the average global surface temperature has increased at a pace of 0.17°F each decade, which is comparable to the rate of warming in the contiguous 48 states (see Figure 2). But since the late 1970s, the United States has warmed up more quickly than the rest of the world. Temperature and precipitation are the two main determinants of a region's climate. Of course it matters what the area's average annual temperature is, but it also matters what the annual temperature range is. The difference between the highest and lowest temperature is substantially greater in some places than in others.
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