Name: 

Scientists conduct multiple trials of their experiments because ____.

Scientific ____ must be supported by observations and results from many investigations and are not absolute.

A biology class in Louisville conducted a survey of the plant species found on their school grounds. They found several plants that they didn’t recognize. What resources would be most helpful to the class in identifying the plants and determining if they were introduced as exotic species?

In 1869, DNA was discovered within the nuclei of cells. By the 1940s, scientists knew that chromosomes were made of both DNA and protein but did not know which was the genetic material of cells. In the 1950s, scientists demonstrated that DNA is the material responsible for heredity.  In 1953, using information collected by other scientists, an American biologist and an English physicist built a three-dimensional model of DNA. These discoveries best illustrate the importance of —

Richard was observing black swallowtail butterflies in the field. Which one of these is an observation he made about a black swallowtail butterfly?

Which of the following is most correct:

The major importance of Francesco Redi’s expermiment in 1668 is

Which statement below is most accurate?

Joseph is performing an experiment to determine the affect of different types of fertilizer on the corn plants in his father’s garden.  His father has never used a fertilizer before and is curious to see how his yield changes if he tries one.  Joseph buys four different brands of fertilizer and plants four different rows of the same corn, using a different fertilizer for each row.  He then charts the growth of each row and corn production of each row during the summer.

In Joseph’s experiment, the growth and corn production would be considered the

Joseph’s teacher informs him that he doesn’t have a control group and would need to add one in order for his experiment to be valid.  Joseph should have had which of the following as his control?

The presence of the same ____ on several continents supports the hypothesis of continental drift.

Matching ____ on different continents are evidence for continental drift.

In the process of convection, hot material in the asthenosphere rises while cooler material near the surface of this layer sinks. When the warmer material cools, it becomes denser and begins to sink back down. How does the process of convection affect the asthenosphere?

The youngest rocks on the ocean floor are located ____.

The crust and upper mantle make up Earth's ____.

Plates of the lithosphere float on the ____.

Which of the following is true about the lithospheric plates?

A type of earth change that is not caused directly by convection currents would be

According to Figure 7-1, what type of plate boundary occurs between the North American Plate and the Eurasian Plate?

The hypothesis for the extinction of the dinosaur that has the most supported evidence is

Which contributes most to creating low tides?

____ is a force that attracts all objects toward each other.

Which point in the diagram below shows the position of a lunar eclipse?

Which point in the diagram above could produce a solar eclipse?

Seasons are a result of ______.

Which statement about winter is true?

Astronauts are much lighter when they walk on the Moon than when they walk on Earth.  This is because of

During spring tides, high tides are higher than normal and low tides are lower than normal.  What is the most likely cause of spring tides?

The further away objects are from each other, the _________ the pull of gravity

The gravitational pull of the Moon has a greater effect than the pull of the Sun on the tidal changes in Earth’s ocean.  The most likely reason for this is

An astronaut is standing on the deck of a spacecraft which is orbiting Earth. He throws a moon rock sample towards outer space (where there is no friction). How much force is needed to keep the rock moving?

John accidentally left his books on top of his mom’s car before they left for school. The books stayed on top of his car while they were driving north on Oak Avenue. Then, when they made a sharp turn eastward onto Harris Lane, his books fell off the top of his car and onto the street.

A ball is thrown straight up in the air. According to Newton's first law of motion, what is the reason for the ball falling back to Earth?

Two teams are playing tug-of-war. Each team is pulling on the rope with a force of 500 newtons. A ribbon is tied to the middle of the rope to determine the winner. Which of the following would result in the greatest acceleration of the ribbon?

When a gallon of milk on Earth is compared to the same gallon of milk in space, the milk on Earth has the same mass but a different __________.

When two birds are pulling on a worm and the worm moves toward the first bird, you know that the forces are ____.

Which of the following is NOT an acceleration?

Two identical plastic bottles are dropped at the same time from a high tower. One of the bottles is completely filled with water and the other is only half full of water.

Which of the following statements is true?

An unbalanced force acting on an object causes it to ____.

Force pairs act in __________ and are __________ in size.

Why can’t scientists always use the principle of superpostion to determine the relative ages of rock layers?

Little is known about much of Earth’s early history because ____.

Which sequence of letters describes the rock layers in the diagram from youngest to oldest?

Cenozoic Era life-forms include ____.

With ____ dating, a rock's exact age can be determined, whereas with ____ dating, a rock's age is compared to the ages of other rocks.

Ramona used this graph during an investigation about radioactive decay.  The graph shows the radioactive decay rate of the isotope strontium-90.  According to the graph, what is the half-life of strontium-90?

A scientist is trying to determine the age of a fossil.  If the scientist wants to find the fossil’s age in years, which method should she use?