The volume and the mass of substance are 15cm cube and 27 grams respectively. Find its density​

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?