Observation Vs. Inference Study Notes

Mr. Gates

Observation

A method scientists use with their senses such as sight, touch, taste, etc.

Inference

An educated guess based on past knowledge leading to a conclusion.

Pangea

A supercontinent that existed when all continents were joined together.

Continental Drift Theory

Proposed by Alfred Wegner, suggesting that continents were once part of a single landmass.

Evidence of Pangea

Includes puzzle pieces, plant and animal fossils, and broken mountains.

Fossil Evidence

Includes fossils like Mesosaurus (a freshwater dinosaur) and Glossopteris (a plant that grows in temperate climates).

Climate Evidence

Rock changes indicating past climates, such as coal deposits in Antarctica and glacial coverage in India, Australia, and South America.

Main Reason for Rejection of Wegner’s Theory

Lack of a mechanism to explain the forces responsible for the movement of the earth.

Density

The reason some materials sink while others rise.

Convection

The circular pattern of movement caused by hot materials rising and cold materials sinking.

Connection between Hot Plate and Mantle

The core acts like a hot plate, while the mantle behaves like the liquid above it, with hot areas rising and cool areas sinking.

Mantle Convection

The mechanism that explains how continents drift apart.