Question

Which of the following statements is true?
A. 0.3% of the Earth's water is fresh water.
B. 97% of the Earth's water is salt water.
C. 30.1% of the Earth's water is salt water.
D. 97% of the Earth's water is fresh water.

Answer 1

@harpellet1202

Answer 2

pllz help

Answer 3

A. 0.3% of the Earth's water is fresh water.

Answer 4

thz

Answer 5

Dr. Maxwell performed several experiments which seem to indicate that eating chocolate is always bad for your health. How should other scientists respond to Dr. Maxwell's research?
A. They should accept Dr. Maxwell's research without argument.
B. They should try to reproduce Dr. Maxwell's research to verify his results.
C. They should ignore Dr. Maxwell's research.
D. They should join Dr. Maxwell's lab and continue his research.

Answer 6

@harpellet1202

Answer 7

B. They should try to reproduce Dr. Maxwell's research to verify his results.

Answer 8

Convection currents form when warm air rises and cold air sinks. What causes the warm air to rise and the cold air to sink?
A. a difference in density
B. a difference in climate
C. a difference in substance
D. a difference in weather

Answer 9

@dusty

Answer 10

@amistre64

Answer 11

A. a difference in density

Answer 12

Through which of the following will a light wave travel the fastest?
A. air
B. glass wall
C. outer space
D. water

Answer 13

A. air

Answer 14

A cell phone company is interested in designing a cell phone that works underwater. They assign the problem to a team of scientists. What would you suggest the scientists do first to solve the problem?
A. Build a model of some possible designs.
B. Research the problem.
C. Make a list of all of the constraints.
D. Design a new technology.

Answer 15

@seiga

Answer 16

@ajprincess

Answer 17

im thinking either b or c

Answer 18

thx i got it

Answer 19

Waves transport _______ over distances.
A. gases
B. liquids
C. solids
D. energy

Answer 20

energy

Answer 21

Omar wants to determine if the mass of a model rocket affects how long the rocket is able to stay up in the air. To do this, he constructs three identical rockets and then fills two of the rockets with varying amounts of sand to add mass. He then launches the rockets one at a time and times how long they are able to stay airborne.

What is the independent variable in Omar's experiment?
A. the force with which each rocket is launched
B. the materials out of which the rockets were made
C. the time the rockets remain airborne
D. the masses of the model rockets

Answer 22

Which of the following changes would increase the strength of the magnetic field?
A. decreasing the current
B. removing the core
C. increasing the number of coils
D. adding a light bulb to the circuit

Answer 23

What happens when heat is removed from a liquid and it cools?
A. The energy content increases, and the speed of its particles increases.
B. The energy content decreases, and the speed of its particles decreases.
C. The energy content increases, and the speed of its particles remains the same.
D. The energy content decreases, and the speed of its particles increases.

Answer 24

@AwkwardsWhatIAmFor

Answer 25

@ChemicalX

Answer 26

Aristotle, the ancient Greek philosopher, thought that heavy objects fall to Earth faster than lighter objects. How could Aristotle's hypothesis be supported or disproved?
A. There is no way to discover whether a hypothesis is not correct.
B. Have supporters of Aristotle's idea debate people who disagree with Aristotle's idea.
C. Find out if there is a consensus of opinion among leading scientists.
D. Drop two balls with different weights and observe which ball hits the ground first.