AK SCI Review - Earth & Space 1

What is the primary cause of the different phases of the Moon as observed from Earth?

• The Earth's rotation

• The Moon's rotation

• The relative positions of the Earth, Moon, and Sun

• The Earth's revolution around the Sun

Answer explanation

The different phases of the Moon are primarily caused by the relative positions of the Earth, Moon, and Sun. As the Moon orbits Earth, varying portions of its illuminated side are visible from Earth, creating the phases.

Tags

AK.SCI.6-8.MS-ESS1-1a

How does gravity affect the motion of planets in the solar system?

• It causes planets to move in straight lines

• It keeps planets in orbit around the Sun

• It has no effect on planetary motion

• It pushes planets away from the Sun

Answer explanation

Gravity is the force that keeps planets in orbit around the Sun. It pulls them towards the Sun, preventing them from flying off into space and allowing them to move in elliptical paths.

Tags

AK.SCI.6-8.MS-ESS1-2

Explain how the positions of the Earth, Sun, and Moon cause a solar eclipse.

• The Earth is between the Sun and the Moon

• The Moon is between the Sun and the Earth

• The Sun is between the Earth and the Moon

• The Earth and Moon are on opposite sides of the Sun

Answer explanation

A solar eclipse occurs when the Moon is positioned directly between the Sun and the Earth, blocking the Sun's light from reaching the Earth. This alignment is why the correct answer is that the Moon is between the Sun and the Earth.

Tags

AK.SCI.6-8.MS-ESS1-1a

Describe how the tilt of Earth's axis leads to the occurrence of different seasons.

• The tilt causes different parts of Earth to receive varying amounts of sunlight throughout the year

• The tilt changes the distance between Earth and the Sun

• The tilt affects the speed of Earth's rotation

• The tilt causes the Sun to move closer to Earth

Answer explanation

The tilt of Earth's axis causes different parts of the planet to receive varying amounts of sunlight throughout the year, leading to the changing seasons. This variation in sunlight is the primary reason for seasonal changes.

Tags

AK.SCI.6-8.MS-ESS1-1b

How does gravity influence the formation of galaxies?

• It causes galaxies to expand indefinitely

• It pulls stars and other matter together to form galaxies

• It has no effect on galaxy formation

• It pushes galaxies apart

Answer explanation

Gravity plays a crucial role in galaxy formation by pulling stars and other matter together. This gravitational attraction leads to the clumping of matter, which eventually forms galaxies, making this the correct choice.

Tags

AK.SCI.6-8.MS-ESS1-2

Analyze the data to determine which planet in our solar system has the largest diameter.

• Earth

• Mars

• Jupiter

• Venus

Answer explanation

Jupiter is the largest planet in our solar system, with a diameter of about 86,881 miles (139,822 kilometers), significantly larger than Earth, Mars, and Venus.

Tags

AK.SCI.6-8.MS-ESS1-3

Which of the following explains the occurrence of lunar eclipses?

• The Sun moves between the Earth and the Moon

• The Earth moves between the Sun and the Moon

• The Moon moves between the Sun and the Earth

• The Earth and Moon move to opposite sides of the Sun

Answer explanation

A lunar eclipse occurs when the Earth moves between the Sun and the Moon, blocking sunlight from reaching the Moon. This alignment is necessary for the shadow of the Earth to fall on the Moon.

Tags

AK.SCI.6-8.MS-ESS1-1a

Plan an experiment to demonstrate how the tilt of Earth's axis affects the length of daylight during different seasons.

• Use a globe and a lamp to simulate the Sun and observe the shadow patterns

• Measure the temperature changes throughout the year

• Record the speed of Earth's rotation

• Observe the phases of the Moon

Answer explanation

Using a globe and a lamp simulates the Sun's position relative to Earth's tilt, allowing observation of how daylight length changes with seasons. This directly demonstrates the effect of Earth's axial tilt on daylight duration.

Tags

AK.SCI.6-8.MS-ESS1-1b

Use evidence to explain how gravity affects the motion of objects within the solar system.

• Gravity causes objects to move in random directions

• Gravity keeps objects in a fixed position

• Gravity pulls objects towards each other, maintaining their orbits

• Gravity pushes objects away from each other

Answer explanation

Gravity pulls objects towards each other, which is crucial for maintaining their orbits. For example, the Sun's gravity keeps planets like Earth in a stable orbit, preventing them from drifting away into space.

Tags

AK.SCI.6-8.MS-ESS1-2

Construct an explanation using rock strata to describe how the geologic time scale is organized.

• The geologic time scale is based on the color of rock layers

• The geologic time scale is organized by the thickness of rock layers

• The geologic time scale is organized by the sequence and age of rock layers

• The geologic time scale is based on the location of rock layers

Answer explanation

The geologic time scale is organized by the sequence and age of rock layers, allowing scientists to understand Earth's history through the relative dating of these layers, rather than by color, thickness, or location.

Tags

AK.SCI.6-8.MS-ESS1-4