After the exposition, the island was set to become a civilian airport—until the United States entered World War II.
PALEONTOLOGY, AND in particular the study of dinosaurs, is an exciting topic to people of all ages.
Although most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history.
In this activity, students begin a sequencing activity with familiar items letters written on cards.
Once they are able to manipulate the cards into the correct sequence, they are asked to do a similar sequencing activity using fossil pictures printed on "rock layer" cards.
The name 'radioactive' may suggest to you that radioactive elements radiate radio waves, but unfortunately that is not so!
The name 'radioactivity' is a misnomer because these elements have nothing to do with radio waves! To understand radioactivity, we need to explore the structure of an atomic nucleus.electromagnetic radiation,energy radiated in the form of a wave as a result of the motion of electric charges.A moving charge gives rise to a magnetic field, and if the motion is changing (accelerated), then the magnetic field varies and in turn produces an electric field......Classical Electromagnetism cannot explain radioactivity. It's a spontaneous and random phenomenon whereby nuclei of certain chemical elements like Uranium, radiate gamma rays (high frequency electromagnetic radiation), beta particles (electrons or positrons) and alpha particles (Helium Nuclei).By the emission of these particles and radiation, the unstable nucleus gets converted into a stabler nucleus. The Term 'Radioactive' - A Misnomer A radioactive element is a fundamental element whose atomic nuclei demonstrates the phenomenon of radioactivity.Today, the city of San Francisco has set its sights on erecting a second downtown there.