Uranium-238 has a half-life of 4.5 billion years. if earth is about 4.5 billion years old, which statement is true? a. in about 4.5 billion years, there will be the same amount of uranium-238 as there is today. b. about 4.5 billion years ago, there was half as much uranium-238 as there is today. c. about 4.5 billion years ago, there was twice as much uranium-238 as there is today. hell mm

C. About 4.5 billion years ago, there was twice as much uranium-238 as there is today.

Explanation: Radioactive decay process is a type of process in which a less stable nuclei decomposes to a stable nuclei by releasing some radiations or particles like alpha, beta particles or gamma-radiations.

Half life of a radioactive material is the time taken by the material to decompose to half of its original value.

Thus if Uranium-238 has a half-life of 4.5 billion years, it means it has decomposed to half of its original value and thus about 4.5 billion years ago, there was twice as much uranium-238 as there is today.

In next 4.5 billion years, i.e. after two half lives have passed, the amount of uranium will be one fourth of ts original value.

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.

are you like autistic or something?

xd