Review for 6th Grade Science Post-Assessment

Front

Wind is mainly caused by...

Back

the uneven heating of Earth's surface by the sun

Answer explanation

Wind is mainly caused by the uneven heating of Earth's surface by the sun, which creates differences in air pressure. This causes air to move from high to low pressure areas, resulting in wind.

Front

A rising barometer (high pressure) means...

Back

clear skies are likely coming

Answer explanation

A rising barometer indicates high pressure, which typically leads to clear skies and stable weather conditions. Therefore, the correct choice is that clear skies are likely coming.

Front

Which of the following does NOT influence a region's climate? Elevation, Nearness to water, Winds and ocean currents, Longitude

Back

Longitude

Answer explanation

Longitude does not directly influence a region's climate, while elevation, nearness to water, and winds/ocean currents do affect temperature and precipitation patterns.

Front

What is the process of hotter, less dense fluids rising and colder, more dense materials sinking?

Back

Convection

Answer explanation

The process described is convection, where hotter, less dense fluids rise while colder, denser materials sink. This movement creates a cycle that transfers heat, making convection the correct answer.

Front

Global winds and ocean currents on Earth appear to curve rather than move in straight lines because of...

Back

Earth's rotation (Coriolis Effect)

Answer explanation

Global winds and ocean currents curve due to Earth's rotation, a phenomenon known as the Coriolis Effect. This effect causes moving air and water to turn and twist rather than travel in straight lines.

Front

What do moon phases, seasons, and eclipses have in common?

Back

They are all caused by the rotation, revolution, and tilt of Earth and the moon.

Answer explanation

Moon phases, seasons, and eclipses are all influenced by the rotation and revolution of Earth, as well as the tilt of its axis and the moon's orbit. This interaction determines their occurrence and appearance.

Front

Why is one day on Mercury equal to 58 Earth days?

Back

Mercury rotates very slowly on its axis

Answer explanation

One day on Mercury is 58 Earth days because Mercury rotates very slowly on its axis. This slow rotation means that it takes a long time for Mercury to complete one full spin relative to the Sun.

Front

Why does Earth have seasons?

Back

Earth's axis is tilted as it moves around the sun.

Answer explanation

Earth has seasons because its axis is tilted at an angle as it orbits the sun. This tilt causes different parts of the Earth to receive varying amounts of sunlight throughout the year, leading to seasonal changes.

Front

Order the following from SMALLEST to LARGEST: Planet, Star, Galaxy, Universe, Solar System

Back

Planet, Star, Solar System, Galaxy, Universe

Answer explanation

The correct order from smallest to largest is: Planet (smallest), Star, Solar System, Galaxy, and Universe (largest). Thus, the correct choice is 'Planet, Star, Solar System, Galaxy, Universe'.

Front

What keeps the solar system together and keeps Earth orbiting around the sun?

Back

Gravity

Answer explanation

Gravity is the force that attracts objects with mass towards each other. It keeps the planets, including Earth, in orbit around the sun, making it the correct answer to what holds the solar system together.