Wind factors may cause numerous variations, but on most days flights will take off to the north and land from the south.

It is true that the presence of other planets can cause slight variations, but nothing significant.

One important factor that causes variation is differing speech rate.

A more traditional and similar effect, parallax, is the variation caused by motion of the earth around the sun.

Different life experiences cause personal variations within an orientation.

As children enter adolescence, cultural, biological and cognitive changes cause variation in their daily lives.

These spots are believed to cause variations in their observed luminosity.

It is these moments that cause variation in the load distributed between the tires.

The timing of the surveys can also cause variations.

In addition, the timing of surveys can cause variations.