Hello there!
The answer is oil.
~Hello there!
Your question: An imaginary surface extending beneath the continents which limits how deep streams may cut is?
Your answer: An imaginary surface extending beneath the continents which limits how deep streams may cut is base level.
Hope this helps~
As the earth and moon move, the moons gravitational force pulls on the ocean causing it to bulge off the surface of the earth but from our point of view it looks as if the water level is riding and lowering.
Over the past million years, Earth's globally averaged surface temperature has risen and fallen by about 5˚C in ice-age cycles, roughly every 100,000 years or so (Figure 2.1a).
