When was the first ozone hole discovered

Do all frequencies of sound at 40 decibels seem equally loud to your ears? explain

Scientists think the is a solid layer of iron with a liquid layer of iron around it

Explain the law of conservation of mass and how it applies to balancing chemical equations

The faster magma cools, the smaller the mineral crystals form.

Which of the following boxes would have the strongest gravitational pull on a third object positioned at an equal distance from both boxes? Box A: 100 g Box B: 10,000 g A. box b because it has more mass B. box a because it has less mass C.

Which of the following is NOT a type (shape) of galaxy? Question 3 options: a) triangular b) irregular c) spiral d) elliptical

A person lies on a platform which has a scale under both ends. imagine the scale on the left reads 575 n and the scale on the right reads 280 n. when the person gets off the platform, both scales read 70.0 n.

An electron is ejected at a speed of 1.7*10^6 m/s from the electron gun of a computer monitor. If the viewing screen is 32 cm from the end of the gun, how far will the electron travel in the vertical direction before hitting the screen?

Light from a lamp is shining on a surface. How can you increase the intensity of the light on the surface? Light from a lamp is shining on a surface. How can you increase the intensity of the light on the surface? A.

If a wave were to hit a flexible, moveable surface what will it do?