Which of the following describes an investigation to determine a chemical property? A Measuring the density of a sample of balsa wood
B Determining the melting point of lead
C Measuring the boiling point of sugar water
D Determining the reactivity of baking soda and vinegar

Explain how you might determine the rate of weathering on a sample rock

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?

Scientists observed a rock stratum with fossil. if mollusks evolved before arthropod, where will their fossils be found.