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  2. Conrad discontinuity - Wikipedia

    en.wikipedia.org/wiki/Conrad_discontinuity

    Therefore, the seismologists of that time considered that the Conrad discontinuity should correspond to a sharply defined contact between the chemically distinct two layers, sial and sima. [2] Despite the fact that sial and sima are two solid layers, the lighter sial is thought to "float" on top of the denser sima layer.

  3. Change and continuity - Wikipedia

    en.wikipedia.org/wiki/Change_and_continuity

    Change and continuity is a classic dichotomy within the fields of history, historical sociology, and the social sciences more broadly. The question of change and continuity is considered a classic discussion in the study of historical developments. [ 1 ]

  4. Environmental determinism - Wikipedia

    en.wikipedia.org/wiki/Environmental_determinism

    The lack of change leads them to wear the same clothes, eat the same fame, breathe the same damp air, and refrain from labor. This continuity and the lack of strong shifts in climate is what Hippocrates identifies as the cause for their appearance.

  5. Cross-cutting relationships - Wikipedia

    en.wikipedia.org/wiki/Cross-cutting_relationships

    Cross-cutting relationships can be used to determine the relative ages of rock strata and other structures. Explanations: A – folded rock strata cut by a thrust fault; B – large intrusion (cutting through A); C – erosional angular unconformity (cutting off A & B) on which rock strata were deposited; D – volcanic dike (cutting through A, B & C); E – even younger rock strata (overlying ...

  6. Greenhouse and icehouse Earth - Wikipedia

    en.wikipedia.org/wiki/Greenhouse_and_icehouse_Earth

    Throughout Earth's climate history (Paleoclimate) its climate has fluctuated between two primary states: greenhouse and icehouse Earth. [1] Both climate states last for millions of years and should not be confused with the much smaller glacial and interglacial periods, which occur as alternating phases within an icehouse period (known as an ice age) and tend to last less than one million years ...

  7. Transition zone (Earth) - Wikipedia

    en.wikipedia.org/wiki/Transition_zone_(Earth)

    The transition zone is the part of Earth's mantle that is located between the lower and the upper mantle, most strictly between the seismic-discontinuity depths of about 410 to 660 kilometres (250 to 410 mi), but more broadly defined as the zone encompassing those discontinuities, i.e., between about 300 and 850 kilometres (190 and 530 mi) depth. [1]

  8. Geographic mobility - Wikipedia

    en.wikipedia.org/wiki/Geographic_mobility

    Geographic mobility is the measure of how populations and goods move over time. Geographic mobility, population mobility, or more simply mobility is also a statistic that measures migration within a population.

  9. Principle of lateral continuity - Wikipedia

    en.wikipedia.org/.../Principle_of_lateral_continuity

    The principle of lateral continuity states that layers of sediment initially extend laterally in all directions; in other words, they are laterally continuous. As a result, rocks that are otherwise similar, but are now separated by a valley or other erosional feature, can be assumed to be originally continuous.

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