Earth's biodiversity remains a reservoir for ________.
A) water and waste production by humans
B) pests and disease
C) habitat extinction and species destruction
D) foods and medicines
E) oil and coal
Question 2
When examining the Keeling Curve in the accompanying graph, one notices a zigzag upward-moving curve. What do these small up and down movements indicate?
A) weather-related factors affecting CO2
B) seasonal cycles in CO2 concentrations
C) O2 versus CO2 concentrations
D) latitudinal differences in CO2 concentrations
E) uncertainty in the CO2 conditions
The Sun is the nearest star to Earth.
water molecules
The Mass of Impacts on Earth
Anatomically modern humans from the Israeli cave sites of Skhul and Qafzeh may be the earliest found
Moving currents are affected by Earth’s rotation
A Well of Sources for Bottled Water