8th Grade Science Ohio Semester 1 Final Study Guide

Front

What is feedback in a scientific context?

Back

Feedback is a process where the output of a system influences its own operation, often used to maintain stability or control, such as a thermostat regulating temperature.

Front

What is half-life in terms of radioactive decay?

Back

Half-life is the time required for half of the radioactive atoms in a sample to decay, indicating the stability and longevity of the element.

Front

Why is old oceanic crust more dense than new oceanic crust?

Back

Old oceanic crust is more dense because it is cooler, which causes it to contract and become denser than the newer, hotter crust.

Front

Which planet in our solar system rotates the fastest?

Back

Jupiter rotates the fastest, completing a rotation in about 10 hours.

Front

Does the law of superposition help determine the absolute age of rock layers?

Back

False. The law of superposition helps determine the relative age of rock layers, not the absolute age.

Front

What is the scientific method?

Back

The scientific method is a systematic process for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge.

Front

What are scientific models?

Back

Scientific models are representations of objects, systems, or concepts that help explain and predict phenomena in the natural world.

Front

What is the difference between relative age and absolute age?

Back

Relative age is the age of an object in relation to other objects, while absolute age is the actual age of an object, often determined through radiometric dating.

Front

What is the significance of the mid-ocean ridge?

Back

The mid-ocean ridge is a divergent boundary where new oceanic crust is formed, playing a crucial role in plate tectonics and seafloor spreading.

Front

What is the role of a thermostat in a heating system?

Back

A thermostat regulates temperature by switching the heating system on or off based on the room temperature.