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Home > All Images > 2002 > July

July Gallery

Choose from 1,428 pictures in our July collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Artwork of the stages in human evolution Featured July Print

Artwork of the stages in human evolution

Human evolution. Illustration showing stages in the evolution of humans. At left, proconsul (23-15 million years ago) is depicted hypothetically as an African ape with both primitive and advanced features. From it Australopithecus afarensis (>4- 2.5 Myr BP) evolved and displayed a bipedal, upright gait walking on two legs. Homo habilis (2.5 Myr BP) was truly human ("homo") resembling Australopithecus but also used stone tools. About 1.5 Myr BP Homo erectus (at centre) appeared in Africa, used fire, wooden tools, and migrated from Africa into Eurasia. Homo neanderthalensis (200, 000 years BP) lived in Europe and Middle East and was closely related to modern humans (right)

© DAVID GIFFORD/SCIENCE PHOTO LIBRARY

Three states of matter, ice, water, steam Featured July Print

Three states of matter, ice, water, steam

States of matter. Illustration showing three states of matter for water; solid (ice), liquid (water) and gas (steam). The state of matter (or phase) of a substance depends on the ambient temperature and pressure. At any combination, there is a dynamic equilibrium between two or more phases. Water at a temperature of 0. 072 Celsius and an ambient pressure of 612 Pascal has a dynamic equilibrium between all three phases - this is known as its triple point. A fourth phase, the plasma, exists at extremely high temperatures and is normally seen only in elements

© MEHAU KULYK/SCIENCE PHOTO LIBRARY