The Emperor and Hawaiian Volcanic Chains ..

The seafloor spreading hypothesis was proposed by the American geophysicist Harry H

Tracing the Development of the Theory of Plate …

The of an ice age is only a few hundred years old, and was , who got his first ideas from and others. There had also been . By the 1860s, most geologists accepted the idea that there had been a cold period in Earth’s recent past, attended by advancing and retreating ice sheets, but nobody really knew why. Hypotheses began to proliferate, and in the 1870s, proposed the idea that variations in Earth’s orientation to the Sun caused the continental ice sheets. Because of problems in matching his hypothesis with dates adduced for ice age events, it fell out of favor and was considered dead by 1900. Croll’s work regained its relevance with the publication of a paper by (usually spelled Milankovitch in the West) in 1913, and by 1924, Milankovitch was widely known for explaining the timing of advancing and retreating ice sheets during the current ice age.

15/12/2017 · Investigations of oceanic magnetic anomalies have further corroborated the seafloor spreading hypothesis

Energy and the Human Journey: Where We Have Been; …

Another key set of tensions are those between theorists, empiricists, and inventors. Theorists attempt to account for scientific data and ideally predict data yet to be adduced, which tests the validity of their hypotheses and theories. often produce that scientific data. Inventors create new technologies and techniques. Albert Einstein is the quintessential example of a theorist, who never performed experiments relating to his theories but accounted for experimental results and predicted them. , who performed the experiment that produced results that various scientists wrestled with for a generation before Einstein proposed his , never suspected that their experiment would lead to the theories that it did. The most important experiments in science’s history were often those producing unexpected results and were usually called failures. Einstein’s had no experimental evidence when he proposed it (it , but that was the only evidence for it when the theory was proposed), but it has been confirmed numerous times since then. Einstein expected that his theories would eventually be falsified by experimental evidence, but that the best parts of his theories would survive in the new theories.

The Emperor and Hawaiian Volcanic Chains: How well do they fit the plume hypothesis?

Scientists are unanimous that the Western Hemisphere’s indigenous peoples primarily came from East Asia, but there has been a cottage industry for centuries proposing other ideas. When Thomas Jefferson sent the expedition to North America’s west coast in 1804 to , they were alerted to find the lost tribes of Israel. But genetic, anatomical, archeological, and other evidence has long since settled the issue of where American Indians came from, and by far the leading hypothesis is that humans migrated to North and South America beginning about 15 kya, and there may have been a migration along the Pacific coastline, which continued the . As the , a corridor between them formed and humans walked to North America about 11 kya. Those arrivals founded the . The sudden disappearance of virtually all the megafauna of North and South America followed those humans, particularly those that came by land and spread. That situation is where the original “” label was used.

Make research projects and school reports about continental drift …