8 Terms
Contributors in Geography
Geography
Great circle route
Geography; Geography
The shortest distance between two places on the Earth's surface. The route follows a line described by the intersection of the surface with an imaginary plane passing through the Earth's center.
Harmonic tremor
Geography; Geography
Continuous rhythmic earthquakes in the Earth's upper lithosphere that can be detected by seismographs. Harmonic tremors often precede or accompany volcanic eruptions.
Glacial till
Geography; Geography
The mass of rocks and finely ground material carried by a glacier, then deposited when the ice melted. This creates an unstratified material of varying composition.
Growing season
Geography; Geography
The period from the average date of the last frost (in the United States, this occurs in the spring) to the first frost in the fall.
