List three people who helped make travel to the West easier. Explain what they did. help!!!

Meriwether Lewis, William Clark, and Sacagawea.

Lewis filled in as the field researcher, chronicling natural, zoological, meteorological, geographic, and ethnographic data. He additionally assembled examples to send back East for further examination.  

Clark working as the campaign's important waterman and cartographer on the  The Corps of Discovery. His fantastic maps of the West spoke to the best accessible until the 1840s. In addition, he kept a standout amongst the most devoted diaries on the excursion, and his inventive spelling is notable.

Sacagawea was a Shoshone Indian lady who, as mediator, voyaged a great many wild miles with the Lewis and Clark Expedition .

She turned out to be a critical resource from various perspectives: hunting down consumable plants, making shoes and garments, just as easing doubts of moving toward Indian clans through her quality; a lady and kid going with a gathering of men showed serene goals.

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)