Earth System and Formation

These flashcards cover key vocabulary and concepts related to the Earth's formation, structure, and geological processes as discussed in the lecture.

Big Bang

A large explosion that resulted in the formation of the Earth and the universe, occurring approximately fourteen billion years ago.

Hydrogen

The simplest atom and the first element in the periodic table, which was one of the original elements formed after the Big Bang.

Helium

The second simplest atom, formed when hydrogen atoms began to fuse together after the Big Bang.

Nebular Hypothesis

A theory that explains the formation of solar systems, suggesting that large gas clouds in space lead to the formation of stars and planets.

Gravitational Forces

The attraction between objects with mass that causes them to pull towards each other, affecting the behavior of materials in space.

Density Stratification

A physical process where heavy materials sink and lighter materials rise, leading to the layered structure of the Earth.

Mantle

The layer of the Earth between the crust and the core, characterized by semi-solid material.

Outer Core

The liquid layer of the Earth's core, primarily composed of iron and nickel, responsible for generating the Earth's magnetic field.

Inner Core

The solid innermost layer of the Earth, made mostly of iron and nickel.

Seismometer

An instrument that measures and records the motion of the ground during an earthquake.

Radioactive Decay

The process by which an unstable atomic nucleus loses energy by radiation, leading to the decay of radioactive elements.

Half-Life

The time required for half of a quantity of a radioactive substance to decay.

Earth Solidification

The process by which the Earth cooled from a molten state to become solid, which scientists estimate occurred around 4.6 billion years ago.

Uranium-238

A naturally occurring radioactive isotope used in dating rocks to determine their age.

Collision Theory

The theory that suggests planets and moons formed from debris resulting from collisions between large celestial bodies during the Earth's formation.

Crust

The outermost layer of the Earth, composed of solid rock and differing in thickness compared to the other layers.

Lithosphere

The rigid outer layer of the Earth, including the crust and the upper part of the mantle.

Plasticity

The ability of a material to flow or deform under pressure without breaking, as exhibited by the Earth's mantle.

Magma

Melted rock beneath the Earth's surface that can rise to the surface during volcanic activity.

Thermo-convective Cell

A circulation pattern driven by temperature differences, influencing the movement of molten rock in the mantle.

Tectonic Plates

Large pieces of the Earth's crust that move and interact at their boundaries, causing geological activity such as earthquakes and mountain formation.

Mount Everest

The highest mountain on Earth, formed by the collision of tectonic plates, and is still rising at a rate of approximately 1.5 inches per year.

Solar System Formation

The process through which planets, including Earth, formed from dust and gas in the rotating disk around a young star.

Gravitational Orbits

The paths of small particles around larger celestial bodies due to gravitational attraction.

Earthquake

A shaking of the ground caused by the release of energy in the Earth's crust.

Thermal Conductivity

The property of a material to conduct heat, affecting how temperature changes throughout different layers of the Earth.

Geological Uplift

The process where tectonic forces cause the Earth’s crust to move upward, leading to the formation of mountains.

Earth's Age Determination

The scientific methods used to estimate the age of the Earth and its components through techniques like radiometric dating.