ES-Jun 2017 Q21-30

Which ocean current brings warm water to the southeastern coast of Africa?

• Agulhas Current
• Benguela Current
• West Australian Current
• Equatorial Countercurrent

The intensity of insolation at solar noon from November 1 to February 1 in New York State will

• decrease, only
• increase, only
• decrease, then increase
• increase, then decrease

Most scientists infer that a major factor in the increased rate of melting of Earth’s glaciers is

• a decrease in the output of energy from the Sun
• a decrease in Earth’s atmospheric transparency
• an increase in Earth’s orbital distance from the Sun
• an increase in carbon dioxide in Earth’s atmosphere

What is the approximate percentage of geologic time that humans have existed on Earth since its origin?

• less than 1%
• 1.8%
• 11.8%
• more than 25%

The photograph below shows the East African Rift Valley in Africa. Which tectonic movement of Earth’s crust is most likely responsible for this feature?

• convergence of continental crust
• convergence of oceanic crust
• divergence of continental crust
• divergence of oceanic crust

Radioactive dating of fossils and rocks is possible because radioactive isotopes

• are found in all fossils and rocks
• are easily collected and measured
• disintegrate into organic substances
• disintegrate at a predictable rate

The photograph below shows the bedrock structure of a limestone outcrop.
Which process is responsible for the deformation of this bedrock?

• folding
• weathering 
• mass movement
• volcanic activity

Which particles will be transported by a stream moving at a velocity of 5 cm/s?

• pebbles, sand, silt, and clay, only
• sand, silt, and clay, only
• silt and clay, only
• clay, only

The surface bedrock of New York State that is most likely to contain the mineral garnet can be found in an area 30 miles

•  north of Binghamton
• south of Mt. Marcy
• east of Oswego
• west of Utica

The geologic cross section below represents surface landscape features that developed in an arid climate.
A change in climate to one that is more humid would cause the

• shape of the hills to become more rounded
• elevation of the area to become higher
• porosity of the bedrock to increase
• rate of chemical weathering to decrease