What is being used by scientists to organize Earth's history? (1 point)

Question

geological time scale
layers of rock
fossil record
• mass extinction

Answer 1

Scientists use the geological time scale to organize Earth's history.

Answer 2

Which fossilized organisms are most likely found in Earth's lowest rock layer? (1 point)
• snails
• reptiles
• bacteria
• dinosaurs

Answer 3

Bacteria are the fossilized organisms most likely found in Earth's lowest rock layer. These early life forms appeared before more complex organisms like snails, reptiles, and dinosaurs.

Answer 4

A model shows that the moon has grown twice its size, yet it had remained in the same place. In one or two sentences, explain how this would impact the gravity between Earth and the moon. Hint: Use the terms mass and distance in your response.

Answer 5

If the moon were to grow twice its size but remained in the same position, its mass would increase significantly. Since gravitational force is directly proportional to mass and inversely proportional to the square of the distance between two objects, an increase in the moon's mass would increase the gravitational attraction between the Earth and the moon, but the unchanged distance would not affect this gravitational increase due to mass.

Answer 6

Choose two options from the following list. Then, using complete sentences, explain how they are different. (Hint: Think about their characteristics and how they are formed.)
(a) Star and planet
(b) Asteroid and comet
(c) Meteoroid and comet
(d) Galaxy and constellation

Answer 7

I will choose options (a) Star and planet, and (b) Asteroid and comet.

Stars and planets are fundamentally different in their formation and characteristics. Stars are massive celestial bodies that undergo nuclear fusion in their cores, producing light and heat; they are formed from collapsing clouds of gas and dust. In contrast, planets are smaller objects that orbit stars and do not produce their own light; they can form from the leftover material in a protoplanetary disk around a new star and are composed of various materials such as gases, ices, and rocks.

Asteroids and comets also differ significantly in their composition and orbits. Asteroids are primarily composed of rock and metal and typically reside in the asteroid belt between Mars and Jupiter, following more stable, circular orbits. Comets, on the other hand, are made of ice, dust, and rocky material, and they have elongated, elliptical orbits that bring them close to the Sun, causing their ice to vaporize and create a glowing coma and tail.