How do scientist record changes in the earth

First out the blocks with the official data was the Japan Meteorological Agency (JMA). Earlier this month, it confirmed 2014 had taken the top spot with global temperatures 0.27 degrees Celsius above the long-term average. Today, it’s the turn of NASA and the US National Oceanic and Atmospheric Administration, with the UK Met Office following suit next week.

Why so many records? While global temperature is a simple enough idea, measuring it is harder than you might think. We take a look at how scientists measure global temperature.

a characteristic is a deep cut in the earth or left over rock aka till.