two speakers are placed side by side and are described as having constructive interference. how do you know when constructive interference of sound waves has occurred?

the sound waves will combine to be larger, so the volume will be louder.

the waves will flatten out or disappear completely when two waves meet each other.

the sound waves will combine, so the waves will cancel each other out.

the sound waves will combine to be larger, so there will be no volume.

the answer is d. chordata

1. the geologists have established a set of principals that can can be used o determine the relative ages of rock. this principal is applied to sedimentary and volcanic rocks. the rocks exposed to wall of grand canyon has layers and by studying the number of horizontal layers in the rock(strata) the relative age can be determined. the layer first formed will appear at the bottom and the the layer of strata last formed appear at the top. by using this information the approximate age of rocks can be determined.

2. carbon dating is used to find the relative age of rock in numbers which means for the rocks that has age between 1-70,000 years.

3. for the rocks of age range between 1,000 - billion of years potassium-argon dating is used.