11. The major constituents of the Earth's current atmosphere are a. moslty oxygen with some CO2
b. 78% oxygen, 21% nitrogen
C.78% nitrogen, 21% oxygen

12. The Earth's primitive atmosphere
a. was primarily hydrogen and helium, like the giant planets'
b. escaped due to the Earth's rapid loss of heat from its interior
C. was mostly carbon dioxide, since plants hadn't yet formed to add oxygen

13. The Earth's magnetic field stretches out in an area called the
A. Magnetosphere
b. Troposphere
C. Atmosphere

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at