WHAT DO SCIENTISTS DO? WHAT IS SCIENTIFIC METHOD? WHY DO SCIENTISTS PERFORM EXPERIMENTS? FIND OUT MOREWhat makes the stars shine? Why is the sky blue? How did life start on Earth? Science explores…
A preposition links a noun, pronoun, or phrase to another part of a sentence. Because many prepositions show direction, some say that "a preposition is anywhere a cat can go."The cat walked across…
Factropica Fast Facts and quizzes
by Mark Hughes Related Links Great Wall of China Famous Buildings and Structures Seven New Wonders Try our Great Wall of…
You will often hear astronomers refer to the brightness of an object in terms of an objects apparent magnitude.
The term apparent magnitude refers to a star's apparent brightness, or how bright the…
1917 - The October Revolution
Revolutionary leader Leon Trotsky In April, 1917, Lenin and other revolutionaries returned to Russia after having been permitted by the German…
Fascinating but Deadly Hippopotamuses, crocodiles, and hyenas by David Johnson PROFILES OF DANGEROUS ANIMALS Animals Elephants, big cats, and Cape buffaloes Scorpions,…
Neat and Tidy: Classify-DivideWriting WellYou Got Some 'Splaining to Do, Lucy: ExpositionThe Perfect Couple: Cause and EffectNeat and Tidy: Classify-DivideAlike and Different: Comparison and…
(Encyclopedia) crater, circular, bowl-shaped depression on the earth's surface. (For a discussion of lunar craters, see moon.) Simple craters are bowl-shaped with a raised outer rim. Complex craters…
(Encyclopedia) Ptolemaic systemPtolemaic systemtŏlˌəmāˈĭk [key], historically the most influential of the geocentric cosmological theories, i.e., theories that placed the earth motionless at the…
