The correct statement is (A)Why is there a layer of clay between the rocks of the cretaceous and Cenozoic?
What is the Cenozoic Age?
The Cenozoic Era, the third of Earth's major eras, began around 66 million years ago and continues to the present. It was the period of time during which Earth's flora and fauna developed toward the current state and the continents attained their current configuration and geographic placements.
The Paleogene (66 million to 23 million years ago), Neogene (23 million to 2.6 million years ago), and Quaternary (2.6 million years ago to the present) are the three periods into which the Cenozoic Era is typically divided; however, the Tertiary and Quaternary periods have long been considered to be separate time periods of the era.
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- Earth's interior is heated by radioactive decay of elements such as uranium, thorium, and potassium.
- Under Earth's crust is a malleable layer of heated rock known as the asthenosphere
- The asthenosphere circulates as convection currents underneath the solid lithosphere.
Explanation:
The asthenosphere is the upper part of the mantle that has the property of semi-plasticity. It is the layer that has convention current responsible for tectonic plate movement. The lower regions of the layer are heated more by the heat from the core and become less dense. The layers from the bottom rise and the cooler upper layers sink to the bottom. This cycle continues just like any other convection currents in a fluid.
As these convection currents churn about, they drag the lithosphere above, at the lithosphere–asthenosphere boundary, by the force of drag.
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Answer:
Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases. These gases are found in layers (troposphere, stratosphere, mesosphere, thermosphere, and exosphere) defined by unique features such as temperature and pressure.
Explanation:
Answer:
The mineral assemblage decreases as the weathering increases.
Explanation:
Mineral assemblage is the term that refers to the amount of minerals that are within a rock. When this rock undergoes weathering, these minerals are removed from the rock because of the sediments that come off of it. There are several types of weathering, among which, we can mention the chemical weathering that occurs through chemical transformations that rocks present due to the influence of temperature and pressure differences in the environment in which the rock is located.
In this case, we can see that chemical weathering creates sediments, which are fragments of rock that have come loose due to chemical transformations. These sediments decrease the amount of minerals inside the rock. In this case, the greater the chemical weathering, the greater the creation of sediments and the smaller the mineral assemblage.