How did researchers in the mid-twentieth century obtain ocean floor samples in order to determine the age of the seafloor?
A) Satellite imagine images
B) Deep-diving manned submersibles
C) Hydraulic vacuum tubes
D) Drilling ships
Question 2
Which of the following statements best describes the tectonic setting for Mount St. Helens and the other Cascade volcanoes?
A) A chain of young, active volcanoes built on a continental margin above a sinking slab of oceanic lithosphere
B) A chain of old, inactive volcanoes built while western North America moved over a mantle plume
C) Old, deeply eroded volcanoes built before the Pacific Ocean existed
D) Young, deeply eroded, basaltic volcanoes built when western North America was over the present-day site of the Hawaiian hot spot
Massive amounts of wood are stored on the forest floor of old-growth temperate coniferous forests of
Measures of ocean chlorophyll-a concentrations from part of Atlantic Canada in (a) January 2006, and
Wang Guochen, c. nineteenth century
How to determine an equation in factored form from a graphed parabola
Samples of the DNA separated by gel electrophoresis