What type of surface movement existed before plate tectonics?
It the assumption is made that the earth was mainly liquid ball there would have been convection currents in the liquid.
The earth's liquid surface would have been moved by convection currents, resulting in the formation of the tectonic plates as the hardened magma that underlies the crust. It is possible that there was never a crust at all.
The liquid magma would have moved in the same general way.
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The fixed landmass theory or continental drift was the most widely accepted explanation for surface movement prior to plate tectonics.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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