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What do these two changes have in common? Select all that apply.

rust forming on a metal gate
snails growing shells
(1 point)

Both are only physical changes
Both are only physical changes

Both conserve mass
Both conserve mass

Both are changes in state
Both are changes in state

Both are chemical changes

7 answers

The two changes, rust forming on a metal gate and snails growing shells, have the following in common:

  • Both conserve mass (during the processes, the mass of the system remains constant, even if it appears to change).

  • Both are chemical changes (the formation of rust involves a chemical reaction with oxygen and moisture, while the growth of shells involves biochemical processes that result in new materials).

The options "Both are only physical changes" and "Both are changes in state" do not apply to either phenomenon. Therefore, the correct selections are:

  • Both conserve mass
  • Both are chemical changes
Which of the following best describes the gravitational force on the Moon compared to Earth?

(1 point)
Responses

The Moon has stronger gravity than Earth.
The Moon has stronger gravity than Earth.

The Moon has weaker gravity than Earth.
The Moon has weaker gravity than Earth.

The Moon has the same gravity as Earth.
The Moon has the same gravity as Earth.

The gravity on the Moon depends on its distance from the Sun.
The gravity on the Moon depends on its distance from the Sun.

The correct response is:

The Moon has weaker gravity than Earth.

The gravitational force on the Moon is about 1/6th that of Earth, meaning that gravity on the Moon is significantly weaker than on Earth.

What process transfers energy from the Sun's core to its surface?(1 point)
Responses

Convection
Convection

Radiation
Radiation

Conduction
Conduction

Diffusion

The correct response is:

Radiation

Energy is transferred from the Sun's core to its surface primarily through radiative processes. Photons produced in the core take a long time to travel through the radiative zone before reaching the outer convective zone, where convection then plays a role in transporting the energy to the surface. However, the initial process of energy transfer from the core to the radiative zone is predominantly through radiation.

Earth is in constant motion. It rotates once every 24 hours, which causes day and night. Earth also orbits the Sun once every year. During Earth's orbit, different parts of Earth experience different seasons. For example, the model below shows Earth at a point in its orbit when it is winter in the Northern Hemisphere and summer in the Southern Hemisphere.

Label the model.

(1 point)

Certainly! To label a model of Earth in its orbit around the Sun during a time when it is winter in the Northern Hemisphere and summer in the Southern Hemisphere, you would typically include the following labels:

  1. Sun - The central star around which Earth orbits.
  2. Earth - The planet itself, positioned in its orbit.
  3. Northern Hemisphere - The upper part of the Earth, experiencing winter.
  4. Southern Hemisphere - The lower part of the Earth, experiencing summer.
  5. Axis Tilt - The tilt of Earth’s axis (approximately 23.5 degrees) indicating how it affects the seasons.
  6. Winter - A label on the Northern Hemisphere to indicate that it is winter at this point in the orbit.
  7. Summer - A label on the Southern Hemisphere to indicate that it is summer at this point in the orbit.

If you have a specific image or model in mind, feel free to share more details, and I can provide a more tailored labeling suggestion!