What is the absolute location of the southern border of texas?

Texas is positioned in both the northern and western hemispheres. Located in the southern Gulf-Coast region of the United States of America - a part of North America - it's bordered by the U.S. States of New Mexico, Oklahoma, Arkansas, Louisiana, as well as the Gulf of Mexico.

Which one is the underlined word?

Magma is outside the volcano  and lava is inside the volcano.