A Danish Seismologist Was the First to Discover

Q58: Continents float high because they are<br>A)denser than

Q59: When did biology's Big Bang (evolutionary explosion)occur?<br>A)approximately

Q60: Which of the following statements about convection

Q61: In which of the following subsystems is

Q62: The densest part of Earth is the<br>A)oceanic

Q64: Solar energy energizes which of Earth's components?<br>A)atmosphere<br>B)biosphere<br>C)hydrosphere<br>D)all

Q65: Stony meteorites are similar in composition to

Q66: Devices used to detect earthquakes are called<br>A)thermometers.<br>B)vibraphones.<br>C)seismometers.<br>D)tilt

Q67: Large continental masses had formed on Earth

Q68: Roughly how much extraterrestrial material falls on