6th Grade Science Exam Review

Alfred Wegener

Known for the Theory of Continental Drift

Theory of Continental Drift

Proposes continents were once a single landmass

Plate Tectonics Evidence

Includes fossils, rock formations, and climate data

Driving Force of Plate Movement

Convection currents in the mantle

Types of Crust

Continental (thicker, less dense) & Oceanic (thinner, denser)

Convergent Plate Boundaries

Plates collide, causing subduction or mountain formation

Divergent Plate Boundaries

Plates move apart, creating new crust

Transform Boundaries

Plates slide past each other, causing earthquakes

Harry Hess

Known for Seafloor Spreading theory

Seafloor Spreading

Process where new oceanic crust forms at mid-ocean ridges

Volcano Formation

Occurs when magma rises through the Earth's crust

Rock Composition

Silicate rocks make up Earth's crust

Element vs. Compound

Elements are pure substances, compounds are chemically bonded

Physical vs. Chemical Change

Physical change alters form, chemical change creates new substances

Abundant Elements in Earth's Crust

Oxygen, Silicon, Aluminum, Iron

Abundant Elements in Living Things

Oxygen, Carbon, Hydrogen, Nitrogen

Abundant Elements in Oceans

Chlorine, Sodium, Magnesium, Sulfur

Abundant Elements in Atmosphere

Nitrogen, Oxygen, Argon, Carbon Dioxide

Physical Changes to Paper

Folding, tearing, crumpling

Physical Properties of Wooden Ruler

Length, width

Metals from Periodic Table

Copper, Iron, Aluminum

Non-Metals from Periodic Table

Oxygen, Nitrogen, Sulfur

Metalloids from Periodic Table

Silicon, Boron, Arsenic

Cell Theory Parts

Cells are basic units, all cells come from pre-existing cells

Autotrophic vs. Heterotrophic

Autotrophs produce own food, heterotrophs rely on others

Prokaryotic vs. Eukaryotic

Prokaryotes lack nucleus, eukaryotes have nucleus

Unicellular vs. Multicellular

Single-celled vs. multiple-celled organisms

Plant Cell Structures

Chloroplasts, cell wall

Chloroplast Function

Photosynthesis, found in plant cells

Ecosystem Relationships

Predatory, competitive, symbiotic interactions

Levels of Organization

Organism, population, community, ecosystem

Variations in Traits

Adaptations to avoid predators

Predator Prey Relationships

Lion - Zebra, Owl - Mouse

Mutualism

Symbiotic relationship benefiting both species

Commensalism

Symbiotic relationship benefiting one species

Parasitism

Symbiotic relationship harming one species