an expert who studies or works in one of the sciences
scientist
extremely large
giant
having a large distance between two sides
thick
a solid object with a square base and four triangular sides that form a point at the top
pyramid
coming before a more important action or event (sự trù bị trước)
preliminary
strange, not known, or not understood
mysterious
a sudden violent movement of the earth's surface, sometimes causing great damage
earthquake
an official decision that is made after a group or organization has voted
resolution
a form of high-energy radiation that originate from outside our solar system các tia vũ trụ
cosmic rays
an organized journey for a particular purpose
expedition
transparent glass of very high quality
crystal
able to be seen
visible
