ESCI-UNIT 2

Open Ended

Have you ever wondered how Earth came to be?

Multiple Choice

Which of the following best describes the analogy used to explain accretion in the formation of Earth?

• Building a snowman by adding snow to a ball

• Melting ice to form water

• Breaking rocks into smaller pieces

• Evaporating water from a pond

Multiple Choice

What is the process called that describes how Earth was formed by accumulating smaller particles?

• Accretion

• Erosion

• Evaporation

• Condensation

Multiple Choice

Based on the descriptions of Planets A, B, C, and D, which planet(s) would be least likely to support life as we know it?

• Planet A and Planet B

• Planet C and Planet D

• Planet A and Planet D

• Planet B and Planet C

Open Ended

What is accretion and why is it important in the formation of planet Earth?

Multiple Choice

Arrange the following steps of accretion in the correct order: (a) Clump of dust grains, (b) Physical collision forms planetesimals, (c) Gravity attracts planetesimals, (d) Formation of a protoplanet.

• a, b, c, d

• a, c, b, d

• a, b, d, c

• b, a, c, d

Multiple Choice

A protoplanet is best described as:

• A fully formed planet

• A planetary embryo made of a collection of matter

• A star in the early stages of formation

• A moon orbiting a planet

Open Ended

Compare and contrast homogeneous and heterogeneous accretion in the context of Earth's formation.

Multiple Select

Which of the following statements about homogeneous and heterogeneous accretion are correct?

• Homogeneous accretion involves materials of the same composition.

• Heterogeneous accretion forms a differentiated planet.

• Homogeneous accretion forms a differentiated planet.

• Heterogeneous accretion involves materials of the same composition.

Multiple Choice

Which of the following is an evidence supporting the homogeneous accretion hypothesis?

• It provides a mechanism that explains the presence of volatile elements in the core.

• It explains the abundance of osmium, iridium, ruthenium, and rhodium in the mantle.

• It qualitatively explains the density differences among terrestrial planets.

• It predicts the abundance of iron, calcium, titanium, and aluminum.

Open Ended

Compare the main evidence and loophole for both homogeneous and heterogeneous accretion hypotheses.

Multiple Choice

Which of the following is a loophole in the heterogeneous accretion hypothesis?

• Accretion must be very fast and does not coincide with the occurrence of large impact craters.

• It cannot explain the presence of volatile elements in the core.

• It provides a mechanism for the abundance of osmium, iridium, ruthenium, and rhodium.

• It explains the density differences among terrestrial planets.

Open Ended

Discuss why water is considered the medium of life and provide examples to support your answer.

Multiple Choice

Which of the following is NOT a learning objective for the lesson 'Water: The Medium of Life'?

• Explain why water is considered the medium of life.

• Discuss the origin of water on Earth.

• Enumerate the uses of water.

• Describe the process of photosynthesis.

Multiple Choice

What does the hydrosphere include?

• All of Earth's water

• Only oceans

• Only rivers

• Only lakes

Multiple Choice

How are bodies of water classified according to the information provided in the images?

• By temperature

• By depth

• By salinity

• By color

Multiple Select

Which of the following are examples of saltwater bodies?

• Seas

• Oceans

• Rivers

• Lakes

Multiple Choice

According to the pie chart, what percentage of Earth's water is freshwater?

• 2.5%

• 10%

• 50%

• 97.5%

Open Ended

Explain how the properties of water, such as density and heat capacity, are important for life on Earth.

Open Ended

What questions do you still have about how Earth was formed according to the accretion hypotheses?

Open Ended

At the end of this lesson, what is one thing you learned about the differences between homogenous and heterogenous accretion hypotheses?