PLEASE HELP WITH GEOGRAPHY

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

The covers all of earth like a thin shell,but it is not a solid sheet of material.it is broken up into several large sections and many smaller ones. fill in the blank.

The declining axolotl population in mexico city is an example of in overcrowded cities. a. the surpassing of support capacity b. changes to natural environments and native species c. the lack of safe homes and tenured spaces d. the effects of a growing urban heat island