First evidence of photosynthesis coincides with:
a. first land animals.
b. initial rise of oxygen in atmosphere.
c. first oceans.
d. first fish.
Answer: B
Physics
- White smoker chimneys at hydrothermal vents are different from black smoker chimneys because:
- The disk-shaped cloud that formed our solar system is called the solar nebula because:
- The preferred theory of the origin of the universe is:
- According to presently preferred theory, the universe:
- Which of the following statements about the Moon is correct?
- During differentiation of Earth, which chemical element concentrated in the center of the Earth?
- Ancient microbial mats preserved in the rock record are called:
- Big Bang theory refers to the:
- Which of the following types of meteorites have a composition most similar to the Earth's core and mantle?
- Milankovitch cycles refer to periodic variations in:
- The CCD stands for:
- In ocean circulation patterns, water leaving the equator and moving north is saltier due to:
- Areas near the equator are warmer than areas near the poles because:
- The CCD refers to:
- Variations in Earth's orbit and rotation cause:
- Red Clays are deep sea sediments that are derived from:
- How does snow cover affect the temperature of an area compared to an area of the same temperature with exposed rock?
- Changes in obliquity can affect Earth's climate by
- Themohaline circulation describes the:
- Siliceous oozes in seafloor sediments indicate areas where:
- An example of a proxy record used by paleoclimatologists is:
- The best records of temperature variation in the last half-million years come from:
- The major nutrients for primary production in order of concentration is
- The tropics, directly adjacent to the equator, typically have ______________ due to convergence and __________ due to divergence