The national museum of american history has on display a tide-prediction machine developed by: matthew maury stevenson and cornish william ferrel sverdrup and munk

Gemstones are commonly found in pegmatites, which are igneous rocks that are a. exceptionally mafic b. exceptionally coarse grained c. exceptionally fine grained d. extrusive, forming from lava

South america is located within which hemisphere?

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