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Thomson's initial 1864 estimate of Earth's age was from 20 to 400 million years old. These wide limits were due to his uncertainty about the melting temperature of rock, to which he equated Earth's interior temperature, [69] [70] as well as the uncertainty in thermal conductivities and specific heats of rocks. Over the years he refined his ...
The Moon is Earth's only natural satellite.It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces between Earth and the Moon have synchronized the Moon's orbital period (lunar month) with its rotation period at 29.5 Earth days, causing the same side of the Moon to always face Earth.
The Americas make up most of the land in Earth's Western Hemisphere. [54] The northernmost point of the Americas is Kaffeklubben Island, which is the most northerly point of land on Earth. [55] The southernmost point is the islands of Southern Thule, although they are sometimes considered part of Antarctica. [56]
The Good Dinosaur is a 2015 American animated adventure film [7] produced by Pixar Animation Studios and released by Walt Disney Pictures.The film was directed by Peter Sohn (in his feature directorial debut) and produced by Denise Ream, from a screenplay written by Meg LeFauve, who also wrote the film's story with Sohn, Bob Peterson, Kelsey Mann, and Erik Benson.
Aristotle's laws of motion. In Physics he states that objects fall at a speed proportional to their weight and inversely proportional to the density of the fluid they are immersed in. [44] This is a correct approximation for objects in Earth's gravitational field moving in air or water. [46]
This list concerns blood type distribution between countries and regions.Blood type (also called a blood group) is a classification of blood, based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (RBCs).
A thermonuclear weapon, fusion weapon or hydrogen bomb (H bomb) is a second-generation nuclear weapon design.Its greater sophistication affords it vastly greater destructive power than first-generation nuclear bombs, a more compact size, a lower mass, or a combination of these benefits.