intermediate senior general science

the rapid development of computer technology since the mid-20th century would not have even been imaginable without the brainpower of individuals dedicated to innovation and turning the seemingly impossible into reality. as far back as the eighteenth century, inventors began setting the stage for future minds to advance hardware and software that would change our world forever. this engaging volume introduces readers to the titans of the technology industry, including bill gates, steve jobs, and mark zuckerberg, among many others.

this title teaches 世界杯2022赛程表淘汰赛 that everything is made of matter, and that physical changes create different forms or states of matter. gives examples of these different states in easy to understand text and introduces 世界杯2022赛程表淘汰赛 to the law of conservation of mass.

formalizing study of the natural world may seem like a daunting task considering the sheer breadth and variety of living things that inhabit the planet. from the microscopic organisms in the worldocos most remote locations to those in the human body, evidence of the intricate structures and mechanisms that enable life are ubiquitous and new discoveries constantly reveal new possibilities that demand to be examined. this volume surveys the multitude of subjects that comprise the field of biology and includes an overview of the development of biology, microbiology, and cell theory.

ebook compton's learn & explore: earth's changing environment

electrical charges pervade nature, including lightning in a thunderstorm and the signals within our own bodies. electrical energy also powers many of the devicesocorefrigerators, televisions, and computers, to name a fewocoupon which modern life depends. this illuminating volume explores the various aspects of electricity, including electric fields, currents, and circuits, as well as the relationship of electricity and magnetism to the functioning of motors and generators."

if people continue to use fuels at the current rate, the earth will run out of its own resources. the effect on the environment will be devastating. this fascinating book uses real-life examples of human energy consumption and the ways in which people can reduce their own energy consumption as well use alternative renewable energy sources.

readers learn that a living organism is a system, or structure, that reproduces, changes with its environment over a period of time, and maintains its individuality by continuous metabolism. to maintain life, an organism repairs or replaces (or both) its structures by a constant supply of the materials of which it is formed. it keeps its life processes in operation by a steady supply of energy. a major contributing part of an organism's survival is the functioning of its cells. this volume provides essential information on cell functions, including amino acids, fibrous and globular proteins, dna, protein synthesis, and metabolism.

brief text and photographs describe the connections between plants, animals, and nonliving things in ecosystems. contents balanced system - living connections - what about change? - show what you know.

emission of harmful greenhouse gases such as carbon dioxide is posing a grave challenge to nature. the problem of global warming needs to be addressed as soon as possible. how to reduce your carbon footprint clearly explains what an individual's carbon footprint is and what we all can do to make a difference. special case studies show how these ideas are currently being put into practice around the world.

updated for 2013, the human body i, is one book in the britannica illustrated science library seriesathat covers today's most popular science topics, from digital tv to microchips to touchscreens and beyond. perennial subjects in earth science, life science, and physical science are all explored in detail. amazing graphics-more than 1,000 per title-combined with concise summaries help 世界杯2022赛程表淘汰赛 understand complex subjects. correlated to the science curriculum in grades 5-9, each title also contains a glossary with full definitions for vocabulary."

despite their proximity to earth, much remains to be learned about the origins and conditions of mercury, venus, and mars. the three smallest planets in our solar system and the three closest to the sunocomercury, venus, and marsocodiffer greatly from each other and from the place we call home. this far-reaching volume travels to each of the inner planets in turn and details the physical characteristics as well as the exploration efforts made in order to learn more about our closest planetary neighbors."