sarcoidosis

malaria

tuberculosis

COVID-19

rainwater

petroleum

salt

animal protein

Plato

Aristotle

Socrates

Pythagoras

chronometer

backstaff

gyroscopic compass

astrolabe

Laid the foundation for the Smithsonian Institute

Was first international expedition sponsored by the US government

He collected sediment samples from around the world

Confirmed that Antartica is a continent

adjacent continents

temperatures

surface areas

tide patterns

Ross Sea

Weddell Sea

Southern Ocean

Arctic Ocean

aluminum

iron

sulfur

cobalt

Continental crust is thinner

Continental crust is heavier

Continental crust is older

Continental crust is darker

meridian

midstratum

mantle

mesosphere

singularity

differentiation

magnetosphere

continental drift

theory of plate tectonics

existence of similar species on different continents

invention of seismographs

discovery of genetic differentiation

convection

electromagnetism

radiation

fusion

shift in a marine ecosystem

divergent plate boundary

convergent plate boundary

transform plate boundary

coastal erosion

earthquake

tsunami

sinkhole