Imagine that a small, bright object appeared in the sky, moved along with a nearby constellation, and then disappeared a year later. Scientists in China, Persia, Europe, and Central America observed the event. Where did this phenomenon most likely occur? How do you know?

Which of the following countries has declared itself nuclear free

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle

Which city area has the most accessible oil reserves a) caspian sea b) siberia c)arctic coast d)lake baikal