Kindergarten Number Sense Worksheets. Music Meets Math Worksheets 1-2 - Students will color one-five instruments in a set and practice printing the names of the instruments. This worksheet reinforces instrument recognition, counting to five, vocabulary, and handwriting.
Plutonium (IPA: /ËpluËËtÉÊniÉm/) is a radioactive, metallic chemical element. It has the symbol Pu and the atomic number 94. It is the element used in most modern nuclear weapons. The most significant isotope of plutonium is 239Pu, with a half-life of 24,100 years. It can be made from natural uranium and is fissile.
Sources of Heat. Scientists believe the earthâs core get its heat from three sources: leftover heat from the planetâs formation, friction and pressure from the outer layers, and energy from radioactive minerals. During the earthâs first 500 million years, the entire planet was a molten blob of matter.Although the exterior has cooled over the billions of years that followed, its inside remains hot. Heat from uranium, thorium and other radioactive elements also keep the temperature high.uring the earthâs first 500 million years, the entire planet was a molten blob of matter. Although the exterior has cooled over the billions of years that followed, its inside remains hot. Heat from uranium, thorium and other radioactive elements also keep the temperature high.