Freddie wanted to determine the effects of a new fertilizer on the growth of tomato plants. He grew five tomato plants in five containers, each having a different concentration of a fertilizer. Each plant was potted in the same type of soil and had the same amount of light. What part of the experiment did he overlook?

• A constant

• The control

• The dependent variable

• The independent variable

Tags

NGSS.MS-ETS1-1

The system was the first model of our solar system, dating back to the times of Aristotle. This model predicted the Earth-centered system. However, not all astronomers were in agreement with the geocentric model. Nicolaus Copernicus devised the heliocentric system with the Sun at the center of our solar system. Copernicus's development of this theory is best described as which of the following?

• Scientific investigation is a key part when creating theories

• Many observations and much evidence is needed in order to create a valid theory.

• Theories may be modified but are rarely discarded.

• None of the above

Tags

NGSS.MS-ESS1-1

Which of the following best describes the hierarchy from the largest to smallest in relation to our solar system?

• Galaxy--> Universe--> Planet--> Solar System

• Universe--> Galaxy--> Solar System--> Planet

• Solar System--> Planet--> Universe--> Galaxy

• Universe--> Solar System--> Galaxy--> Planet

Tags

NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

NGSS.MS-ESS1-3

Which of the following uses star color to represent its surface temperature from coolest to hottest?

• Blue, White, Yellow, Orange, Red

• Yellow, Orange, Blue, White, Red

• Red, Orange, Yellow, White, Blue

• Blue, Yellow, Orange, Red, White

The Sun is 330,000 times more massive than Earth and contains 99.8% of the mass in our solar system; but it is small in comparison to other stars. All stars are classified according to their size. Which of the following is the current classification of the Sun?

• A dwarf star

• A giant star

• A super giant star

• A neutron star

Which of the following statements about gravity is FALSE?

• Gravity plays an important role in the formation of solar systems.

• Gravity keeps the planets in their proper orbits around the Sun.

• Stars are made of clouds of dust and gas that come together as a result of gravity

• The Law of Gravitation states that the gravitational force is stronger as objects get farther apart

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

A lunar eclipse occurs when the Earth's shadow blocks most of the sunlight from directly illuminating all or a portion of the moon's surface. Which of the following is considered to be a total lunar eclipse?

• Visible only from other planets

• Visible only during a full moon

• Visible to all observers on the side of Earth from which the moon would be visible at that time

• An opportunity to study the corona of the Sun

Tags

NGSS.MS-ESS1-1

Which of the following directly affects tides on the Earth?

• Tides are caused only by the moon

• The Sun is not involved in causing tides

• Tides are not caused by the moon

• Tides are caused by the location of the Earth, Sun and moon.

Tags

NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

Every year, water fills a small lake in a dry region. After a few weeks, the lake evaporates, leaving behind a thin layer of crystals that form from minerals dissolved in the lake water. Each year, a new layer is added. Which type of rock is MOST likely to be formed by this process?

• Igneous

• Metamorphic

• Volcanic

• Sedimentary

Tags

NGSS.MS-ESS2-4

A delta is defined as a triangular mass of sediment, silt and sand, deposited at the mouth of a river. Deltas form when a river flows into a body of standing water, such as a sea or lake, and deposits large quantities of sediment. They are usually crossed by numerous streams and channels and have exposed as well submerged areas. Which process was primarily responsible for the formation of a delta?

• Glacial erosion

• Cementation of sediment

• Deposition of sediment

• Mass movement

Tags

NGSS.MS-ESS2-2