The exosphere is a transitional zone between Earth's atmosphere and interplanetary space.

We will continue to work at the problem as we move through this transitional zone around the system.

It is a transitional zone between aquatic and terrestrial habitats.

The latest test scores showed large numbers of students falling into the transitional passing zone from 55 to 64.

It is a transitional zone between the Andean highlands and the eastern forests.

You get a lot of quick downdrafts in the transitional zone.

This is a transitional zone between southern and northern biomes.

Small open balconies provide a transitional zone between the host structure and para-site.

They are located in the transitional zone between the Mediterranean and the continental climate.

A type of boundary is the ecotone, or the transitional zone between two communities.