What is a "Climate system"?

Pls help and if you can explain

¿cual es mas alta en baja california,la migracion o la inmigracion?

What forms of energy are involved when snow on a mountain breaks loose, resulting in an avalanche? during an avalanche, the( 1 ) energy of the snow on the mountain is converted into ( 2 ) energy as the snow cascades down. ( 1 ) a. elastic b. kinetic c. potential d. radiant ( 2 ) a. chemical b. kinetic c. nuclear d. potential

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?