Early and modern theories

Radiometric methods estimate age based on radioactive decay. In exams, connect Earth's age with scientific evidence.

Weizsäcker tried to explain the dynamic structure of the solar nebula. In exams, connect him with modern planet-origin ideas.

Schmidt linked planet formation with gas and dust material. In exams, understand the difference between matter ejected from the Sun and interstellar dust.

Beyond the frost line, ices and gases could accumulate more easily. In exams, remember the relation among distance, temperature, and planet composition.

After the Big Bang, gravitational concentration of matter formed large structures. In exams, remember the order from matter to large structures.

The early atmosphere had little free oxygen and a different gas composition. In exams, remember atmospheric change over time.

In the broad sequence, the universe came first, then galaxies, then the solar system and Earth. In exams, check both scale and order.

The old nebular hypothesis had weak explanations for some physical distributions. In exams, understand the limitation with meaning, not just memory.

Cosmic background radiation is evidence for the Big Bang, not the steady state theory. In exams, identify the theory through clue words.

After solid crust formed, conditions developed for water retention and outer spheres. In exams, connect crust formation with further Earth development.

Accretion builds the planet, while differentiation organizes its interior. In exams, do not mix the processes.

The modern solar nebula theory does not depend on a rare external event. In exams, understand the difference between a normal process and a rare event.

Theories improve with new evidence and better physical understanding. In exams, treat science as changing and evidence-based.

The Big Bang is a cosmological theory, while Earth's origin is explained by the solar nebula and accretion. In exams, write the scale difference.

These gases are linked with the composition of the early atmosphere. In exams, identify atmospheric development from gas names.

Red shift is evidence of receding galaxies and expansion. In exams, understand the chain from evidence to conclusion.

The Sun formed at the center and planet-forming material remained in the disk. In exams, identify the roles of center and disk separately.

Earth evolved through several sequential physical processes. In exams, do not treat one process as the whole story.

The word planetesimal and accumulation of small solid bodies identify this hypothesis. In exams, pay attention to clue words.

The modern theory links many observations together. In exams, identify comprehensiveness as a strength.

First the universe formed, then the solar system, then Earth and its internal layers developed. In exams, remember the order from larger to smaller scale.

Formation of Earth's solid body and formation of atmosphere from gases are different processes. In exams, do not mix stages.

Light elements were part of the early chemical evolution of the universe. In exams, remember basic matter before large bodies.

The Big Bang gives the cosmic background, but Earth's internal layers are explained by differentiation. In exams, connect the correct process with the correct scale.

Inside the frost line, rocky materials remained more, while beyond it ices and gases could remain. In exams, connect temperature, distance, and planetary composition.