Earth Science and Space Systems Lecture Review

A comprehensive set of vocabulary flashcards covering Earth's history, plate tectonics, geological systems, climate mechanisms, and astronomical origins based on the lecture transcript.

Solar nebula

A giant cloud of gas and dust that collapsed under gravity around 4.6 billion years ago to form the Solar System.

Accretion

The process by which smaller space bodies collide and merge to form larger planets, evidenced by the rocky, metal-rich makeup of inner planets.

Radiometric Dating

A method that measures radioactive isotope decay in ancient materials to calculate their absolute age and establish a precise timeline.

Zircon

An incredibly durable uranium-bearing mineral used to find and date the oldest known materials on Earth's crust using Uranium-238 and Uranium-235 systems.

Carbon-14

A radioactive isotope with a half-life of $5,730\,\text{years}$ and a maximum range of $70,000\,\text{years}$, used strictly for dating recent organic material and geological events.

Lithosphere

Earth's solid outer layer divided into large tectonic plates that drift over the flowing mantle.

Seafloor Spreading

The process where new oceanic crust is created by volcanic activity at mid-ocean ridges, causing crust age to increase symmetrically away from the ridge.

Canadian Shield

The ancient core of the North American continent, approximately $2.5\,\text{billion}$ years old.

Constructive Processes

Geologic processes that build land up, such as volcanism, uplift, deposition, and the formation of mid-ocean ridges.

Destructive Processes

Geologic processes that tear land down, such as weathering, erosion, and subduction.

Geosphere

The Earth system comprising rocks, land, soil, landforms, and the internal layers of the planet.

Hydrosphere

The Earth system containing all liquid water, including oceans, lakes, rivers, and groundwater.

Atmosphere

The layer of gases surrounding Earth, including nitrogen, oxygen, and carbon dioxide, which facilitates weather and climate.

Biosphere

The Earth system encompassing all living organisms, including plants, animals, and bacteria.

Cryosphere

The Earth system consisting of frozen water, such as glaciers, ice sheets, and permafrost.

Inner Core

A solid ball composed of iron and nickel at the center of the Earth's layers.

Convection

The process where heat from the core warms the lower mantle, causing material to expand, become less dense, and rise toward the surface.

Porosity

The measure of the amount of open space or voids within a rock or soil.

Permeability

The measure of how easily water can flow through the interconnected spaces within rock or soil.

Stromatolites

Early microbial life forms that evolved in early oceans and contributed to the Great Oxidation Event.

The Great Oxidation Event

A radical change in atmospheric chemistry caused by the evolution of photosynthetic organisms like cyanobacteria producing oxygen.

Precambrian Eon

The largest segment of Earth's history, occurring before the Phanerozoic Eon.

Energy Budget

The balance between energy input from solar radiation and greenhouse gases versus energy output radiated back into space.

Coriolis effect

The driver of global wind belts caused by Earth's rotation and uneven surface heating.

Maritime Tropical $(mT)$

An air mass classification characterized as being humid and warm.

Continental Polar $(cP)$

An air mass classification characterized as being dry and cold.

Carbon Reservoir

Spheres where carbon is trapped; the ocean is the largest active example, followed by the atmosphere and biosphere.

Ice-Albedo Loop

A positive feedback loop where rising temperatures melt ice, lowering surface reflectivity ($\text{albedo}$), leading to more absorption of sunlight and further warming.

Anthropogenic Disruption

Human-caused changes to Earth's systems, such as deforestation and the burning of fossil fuels.

Mitigation

The use of technologies and engineering solutions to minimize human impacts and manage resource sustainability.

Singularity

The hot, dense point from which the universe began approximately $13.8\,\text{billion}$ years ago.

Redshift

The increase in wavelength observed when a galaxy is moving away from Earth, supporting the theory of an expanding universe.

Cosmic Microwave Background Radiation $(CMBR)$

The leftover energy from the Big Bang that exists as a tiny bit of heat everywhere in space.

Nucleosynthesis

The process by which stars produce energy by fusing lighter elements into heavier ones, such as hydrogen into helium.

H-R Diagram

A classification tool for stars showing the relationship between temperature/color on the x-axis and luminosity/mass on the y-axis.

Sunspots

Cooler spots on the Sun's surface caused by increased magnetism that follow an approximately $11\text{-year}$ cycle.

Perihelion

The point in an orbit when a planet or comet is closest to the Sun and moving at its fastest speed.

Aphelion

The point in an orbit when a planet or comet is farthest from the Sun and moving at its slowest speed.

Eccentricity

A measurement of the shape of an orbit; higher values indicate a more elliptical (oval-like) path.

Axial Tilt

The angle of a planet's rotation, also called obliquity, which for Earth is $23.5^{\circ}$ and determines the seasons.

Equinox

A point in Earth's orbit with neutral tilt, resulting in medium sun angles and equal day and night duration.