oce exam1
One of the reasons that free oxygen in our atmosphere is important to the development and maintenance of life on Earth is because oxygen:
can form ozone and block some UV radiation.
A tentative, testable statement about the general nature of a phenomenon is called a/an:
hypothesis
Of the following statements about the asthenosphere, which is/are true?
- Outgassing is a direct result of density stratification. - Density stratification has caused Earth's internal structure to be layered. - Density stratification has caused the highest-density material to be found at Earth's core. - The origin of Earth's oceans and atmosphere are a result of density stratification.
Which of the following ideas about the development of life on Earth make scientific sense?
- The "prebiotic soup" of the primitive oceans provided a likely environment for life to develop. - Primitive life likely existed without the need for oxygen. - As life developed on Earth, it began to significantly change Earth's environment. - Early organisms likely evolved into more complex organisms.
According to the Geologic Time Scale, which selection lists the correct order of coexistence, from earliest to latest?
Trilobites and amphibians, insects and dinosaurs, dinosaurs and birds, flowering plants and fishes, humans and reptiles
All the following were accomplishments of Captain James Cook except :
all the above
eratosthenes
circumference of earth
core
composed mostly of iron and nickel with a liquefied metallic outer layer
lithosphere
crust and the uppermost mantle consisting of a solid rock layer
The lithosphere consists of Earth's __________.
crust and uppermost mantle
The separation of the Earth into layers while it was molten was the result of the:
differing densities of the elements that make up the Earth.
The first person we are aware of who determined the circumference of the Earth using trigonometry and the angle of sunlight at Alexandria, Egypt, was:
eratosthenes
Free oxygen was abundant in the Earth's primordial atmosphere.
false
In Europe, significant oceanographic knowledge was acquired during the Middle Ages.
false
Oceanic crust is less dense than continental crust because it is made of silica and manganese.
false
ptolemy
mapped world with Roman knowledge showing latitude and longitude
The first humans from Western Hemisphere known to have developed the art of navigation were the:
phonecians
Current scientific knowledge indicates that the most likely origin of most of Earth's oceans was due to:
water vapor released from volcanic outgassing.
Earth's current atmosphere supports animal life because __________.
plant photosynthesis provides oxygen that is critical for aerobic respiration
the largest ocean basin, covers more than half of ocean surface
pacific
average depth of worlds oceans
3682 meteres (12080 feet)
The European "Age of Discovery" began with:
christopher columbus dicovering the new world
The water in Earth's oceans came __________.
mostly from volcanic outgassing and partly from comets
how old is earth
4.6 billion years
Which of the following statements regarding continental and oceanic crust is TRUE?
Continental crust is thicker and less dense than oceanic crust.
Of the following statements about the asthenosphere, which is/are true?
The asthenosphere is a plastic layer that extends from the base of the lithosphere to a depth of about 700 kilometers (430 miles). The asthenosphere is very hot and contains areas of partially molten rock.
The Sun and the rest of the solar system formed about 5 billion years ago from a huge cloud of dust and gas called a:
nebula
basalt
oceanic crust
In general, the salinity content of ocean water has remained constant throughout the majority of Earth's history.
true
Radiometric dating is used to determine the ages of rocks.
true
The Earth's crust solidified around 4.5 billion years ago.
true